tools headers UAPI: Sync x86's asm/kvm.h with the kernel sources

tools headers UAPI: Sync x86's asm/kvm.h with the kernel sources

To pick the changes in:

  6517dfbcc918f970 ("KVM: x86: Add x2APIC "features" to control EOI broadcast suppression")
  20c3c4108d58f87c ("KVM: SEV: Add KVM_SEV_SNP_ENABLE_REQ_CERTS command")

This silences these perf build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/arch/x86/include/uapi/asm/kvm.h arch/x86/include/uapi/asm/kvm.h

Please see tools/include/uapi/README for further details.

Cc: Sean Christopherson <seanjc@google.com>
Cc: Khushit Shah <khushit.shah@nutanix.com>
Cc: Michael Roth <michael.roth@amd.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>