X86: implement PCID/INVPCID for hvm

X86: implement PCID/INVPCID for hvm

This patch handle PCID/INVPCID for hvm:

For hap hvm, we enable PCID/INVPCID, since no need to intercept
INVPCID, and we just set INVPCID non-root behavior as running natively;

For shadow hvm, we disable PCID/INVPCID, otherwise we need to emulate
INVPCID at vmm by setting INVPCID non-root behavior as vmexit.

Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
Committed-by: Jan Beulich <jbeulich@suse.com>