Detect AMXFP8 cpuid feature

Signed-off-by: Oleg Zhurakivskyy <[email protected]>

Author: ozhuraki

docs/usage/features.md

@@ -87,6 +87,7 @@ configuration options for details.
 | AMXBF16            | Advanced Matrix Extension, tile multiplication operations on BFLOAT16 numbers |
 | AMXINT8            | Advanced Matrix Extension, tile multiplication operations on 8-bit integers |
 | AMXFP16            | Advanced Matrix Extension, tile multiplication operations on FP16 numbers |
+| AMXFP8             | Advanced Matrix Extension, tile multiplication operations on FP8 numbers |
 | AMXTILE            | Advanced Matrix Extension, base tile architecture support |
 | AVX512BF16         | AVX-512 BFLOAT16 instructions |
 | AVX512BITALG       | AVX-512 bit Algorithms |