Add Intel Granite Rapid features

[fmuyassarov]

Detect:

• AMXFP16 - tile computational operations on FP16 numbers (CPUID.(EAX=7, ECX=1).EAX)
• PREFETCHI - PREFETCHIT0/1 instructions (CPUID.(EAX=7, ECX=1).EDX)

Ref: https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf Tested both flags.