KVM: selftests: Treat AMD Family 17h+ as supporting branch insns retired

When detecting AMD PMU support for encoding "branch instructions retired"
as event 0xc2,0, simply check for Family 17h+ as all Zen CPUs support said
encoding, and AMD will maintain the encoding for backwards compatibility
on future CPUs.

Note, the kernel proper also interprets Family 17h+ as Zen (see the sole
caller of init_amd_zen_common()).

Suggested-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Manali Shukla <manali.shukla@amd.com>
Link: https://lore.kernel.org/r/20240605050835.30491-1-manali.shukla@amd.com


Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>