[clang] [X86][clang-cl] Make AVX10.2 map to the same target-cpu as AVX10.1 (PR #193147)

[via cfe-commits]

Andarwinux wrote:

```
$ echo|clang-cl /arch:AVX10.2 /clang:-dM /clang:-E -|grep AMX
#define __AMX_AVX512__ 1
#define __AMX_BF16__ 1
#define __AMX_COMPLEX__ 1
#define __AMX_FP16__ 1
#define __AMX_FP8__ 1
#define __AMX_INT8__ 1
#define __AMX_MOVRS__ 1
#define __AMX_TF32__ 1
#define __AMX_TILE__ 1
```
Was this expected?

https://github.com/llvm/llvm-project/pull/193147