x86: Cleanup PT_*_MASK flags

Cc: Andrew Jones <drjones@redhat.com>
Cc: Thomas Huth <thuth@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
10 files changed