tools headers UAPI: Sync KVM's vmx.h with the kernel to pick SEAMCALL exit reason

To pick the changes in:

  9d7dfb95 ("KVM: VMX: Inject #UD if guest tries to execute SEAMCALL or TDCALL")

The 'perf kvm-stat' tool uses the exit reasons that are included in the
VMX_EXIT_REASONS define, this new SEAMCALL isn't included there (TDCALL
is), so shouldn't be causing any change in behaviour, this patch ends up
being just addressess the following perf build warning:

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

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

Cc: Sean Christopherson <seanjc@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>