Remove step to build oneMath from build instructions

Author: Rbiessy

docs/backend/SYCL.md

@@ -227,30 +227,10 @@ Upon a successful installation, SYCL is enabled for the available intel devices,
 
 **oneAPI Plugin**: In order to enable SYCL support on Nvidia GPUs, please install the [Codeplay oneAPI Plugin for Nvidia GPUs](https://developer.codeplay.com/products/oneapi/nvidia/download). User should also make sure the plugin version matches the installed base toolkit one *(previous step)* for a seamless "oneAPI on Nvidia GPU" setup.
 
-
-**oneMath for cuBlas**: The current Intel oneMKL releases *(shipped with the oneAPI base-toolkit)* do not contain the cuBLAS backend. [oneMath](https://github.com/uxlfoundation/oneMath) is used instead to dispatch to *cuBLAS* on Nvidia GPUs.
-
-```sh
-git clone https://github.com/uxlfoundation/oneMath
-cd oneMath
-cmake -B buildWithCublas -DCMAKE_CXX_COMPILER=icpx -DCMAKE_C_COMPILER=icx -DENABLE_MKLGPU_BACKEND=OFF -DENABLE_MKLCPU_BACKEND=OFF -DENABLE_CUBLAS_BACKEND=ON -DTARGET_DOMAINS=blas -DCMAKE_INSTALL_PREFIX:PATH=install
-cmake --build buildWithCublas --target install --config Release
-```
-
 - **Adding support to AMD GPUs**
 
 **oneAPI Plugin**: In order to enable SYCL support on AMD GPUs, please install the [Codeplay oneAPI Plugin for AMD GPUs](https://developer.codeplay.com/products/oneapi/amd/download). As with Nvidia GPUs, the user should also make sure the plugin version matches the installed base toolkit.
 
-**oneMath for rocBlas**: The current Intel oneMKL releases *(shipped with the oneAPI base-toolkit)* do not contain the rocBLAS backend. [oneMath](https://github.com/uxlfoundation/oneMath) is used instead to dispatch to *rocBLAS* on AMD GPUs.
-
-```sh
-git clone https://github.com/uxlfoundation/oneMath
-cd oneMath
-# Find your HIP_TARGETS with rocminfo, under the key 'Name:'
-cmake -B buildWithrocBLAS -DCMAKE_CXX_COMPILER=icpx -DCMAKE_C_COMPILER=icx -DENABLE_MKLGPU_BACKEND=OFF -DENABLE_MKLCPU_BACKEND=OFF -DENABLE_ROCBLAS_BACKEND=ON -DHIP_TARGETS=${HIP_TARGETS} -DTARGET_DOMAINS=blas  -DCMAKE_INSTALL_PREFIX:PATH=install
-cmake --build buildWithrocBLAS --target install --config Release
-```
-
 3. **Verify installation and environment**
 
 In order to check the available SYCL devices on the machine, please use the `sycl-ls` command.
@@ -291,6 +271,8 @@ For AMD GPUs we should expect at least one SYCL-HIP device [`hip:gpu`]:
 
 ### II. Build llama.cpp
 
+The SYCL backend depends on [oneMath](https://github.com/uxlfoundation/oneMath). By default it is automatically built along with the project. A specific build can be provided by setting the CMake flag `-DoneMath_DIR=/path/to/oneMath/install/lib/cmake/oneMath`.
+
 #### Intel GPU
 
 ```
@@ -321,10 +303,10 @@ cmake --build build --config Release -j -v
 GGML_SYCL_DEVICE_ARCH=sm_80 # Example architecture
 
 # Option 1: Use FP32 (recommended for better performance in most cases)
-cmake -B build -DGGML_SYCL=ON -DGGML_SYCL_TARGET=NVIDIA -DGGML_SYCL_DEVICE_ARCH=${GGML_SYCL_DEVICE_ARCH} -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icpx -DoneMath_DIR=/path/to/oneMath/buildWithCublas/install/lib/cmake/oneMath
+cmake -B build -DGGML_SYCL=ON -DGGML_SYCL_TARGET=NVIDIA -DGGML_SYCL_DEVICE_ARCH=${GGML_SYCL_DEVICE_ARCH} -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icpx
 
 # Option 2: Use FP16
-cmake -B build -DGGML_SYCL=ON -DGGML_SYCL_TARGET=NVIDIA -DGGML_SYCL_DEVICE_ARCH=${GGML_SYCL_DEVICE_ARCH} -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icpx -DoneMath_DIR=/path/to/oneMath/buildWithCublas/install/lib/cmake/oneMath -DGGML_SYCL_F16=ON
+cmake -B build -DGGML_SYCL=ON -DGGML_SYCL_TARGET=NVIDIA -DGGML_SYCL_DEVICE_ARCH=${GGML_SYCL_DEVICE_ARCH} -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icpx -DGGML_SYCL_F16=ON
 
 # build all binary
 cmake --build build --config Release -j -v
@@ -339,7 +321,7 @@ cmake --build build --config Release -j -v
 # Use FP32, FP16 is not supported
 # Find your GGML_SYCL_DEVICE_ARCH with rocminfo, under the key 'Name:'
 GGML_SYCL_DEVICE_ARCH=gfx90a # Example architecture
-cmake -B build -DGGML_SYCL=ON -DGGML_SYCL_TARGET=AMD -DGGML_SYCL_DEVICE_ARCH=${GGML_SYCL_DEVICE_ARCH} -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icpx -DoneMath_DIR=/path/to/oneMath/buildWithrocBLAS/install/lib/cmake/oneMath
+cmake -B build -DGGML_SYCL=ON -DGGML_SYCL_TARGET=AMD -DGGML_SYCL_DEVICE_ARCH=${GGML_SYCL_DEVICE_ARCH} -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icpx
 
 # build all binary
 cmake --build build --config Release -j -v