Revert "[RISCV] Support RISC-V Profiles in -march option (#76357)"

This reverts commit 66f88de as
there are some failures.

Author: wangpc-pp

clang/docs/ReleaseNotes.rst

@@ -520,7 +520,6 @@ RISC-V Support
 ^^^^^^^^^^^^^^
 
 - ``__attribute__((rvv_vector_bits(N)))`` is now supported for RVV vbool*_t types.
-- Profile names in ``-march`` option are now supported.
 
 CUDA/HIP Language Changes
 ^^^^^^^^^^^^^^^^^^^^^^^^^