x86: Iterate over all INVPCID types in the enabled test

Verify that INVPCID works with all types, even those that take a PCID,
when CR4.PCIDE=0.  So long as the target PCID=0, INVPCID is legal even
if CR4.PCIDE=0.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210212010606.1118184-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>