x86: tst-cpu-features-supports.c: Update AMX check
Pass "amx-bf16", "amx-int8" and "amx-tile", instead of "amx_bf16", "amx_int8" and "amx_tile", to __builtin_cpu_supports for GCC 11.
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Pass "amx-bf16", "amx-int8" and "amx-tile", instead of "amx_bf16", "amx_int8" and "amx_tile", to __builtin_cpu_supports for GCC 11.