KVM: X86: Move handling of INVPCID types to x86

INVPCID instruction handling is mostly same across both VMX and
SVM. So, move the code to common x86.c.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Message-Id: <159985255212.11252.10322694343971983487.stgit@bmoger-ubuntu>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>