KVM: x86: Advertise support for AMD's PREFETCHI

Merge Request Required Information

Summary of Changes

Latest AMD Platforms introduce a new instruction, PREFETCHI, that loads a cache line from a specified memory address into the indicated data or instruction cache level, based on locality reference hints.

Advertise support for the instruction to the user space

Approved Development Ticket(s)

JIRA: https://issues.redhat.com/browse/RHEL-98696
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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