x86: VMX: Mask advanced VM-exit info

Bits [9:11] are undefined in the VM-exit qualification when "advanced
VM-exit information for EPT violations" is not supported.

Mask these bits for now to avoid false failures. If KVM supports this
feature, the tests would need to be adapted, and the masking would need
to be removed.

Unfortunately, I do not have hardware that supports this feature
available for my use to make a better fix.

Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>