Modify build script for MediaTek Neuron (#6292)

Summary:
For `build_android_llm_demo.sh`:
1. Modify how NEURON_BUFFER_ALLOCATOR_LIB is used. In MTK env setup,  NEURON_BUFFER_ALLOCATOR_LIB will point exactly to the libneuron_buffer_allocator.so file.
2. Include a new variable for NEURON_USDK_ADAPTER_LIB which we should expect which will point exactly to the libneuronusdk_adapter.mtk.so

Pull Request resolved: #6292

Reviewed By: kirklandsign

Differential Revision: D64479597

Pulled By: cmodi-meta

fbshipit-source-id: 22536fa88787a86772df8448d56e1924d7c748f1

Author: cmodi-meta

build/build_android_llm_demo.sh

@@ -89,10 +89,10 @@ build_android_native_library() {
   fi
 
   # Copy MTK related so library
-  if [ -n "$NEURON_BUFFER_ALLOCATOR_LIB" ] && [ "$ANDROID_ABI" == "arm64-v8a" ]; then
+  if [ -n "$NEURON_BUFFER_ALLOCATOR_LIB" ] && [ -n "$NEURON_USDK_ADAPTER_LIB" ] && [ "$ANDROID_ABI" == "arm64-v8a" ]; then
     cp "${CMAKE_OUT}"/backends/mediatek/libneuron_backend.so ${BUILD_AAR_DIR}/jni/${ANDROID_ABI}/
-    cp "$NEURON_BUFFER_ALLOCATOR_LIB"/libneuron_buffer_allocator.so ${BUILD_AAR_DIR}/jni/${ANDROID_ABI}/
-    cp "$NEURON_BUFFER_ALLOCATOR_LIB"/libneuronusdk_adapter.mtk.so ${BUILD_AAR_DIR}/jni/${ANDROID_ABI}/
+    cp "${NEURON_BUFFER_ALLOCATOR_LIB}" ${BUILD_AAR_DIR}/jni/${ANDROID_ABI}/
+    cp "${NEURON_USDK_ADAPTER_LIB}" ${BUILD_AAR_DIR}/jni/${ANDROID_ABI}/
   fi
 }