[HVM][VMX] Provide right view of cpuid to the HVM guests.

[HVM][VMX] Provide right view of cpuid to the HVM guests.
Some of the CPU features such as APIC, PAE, MTRR, HT are virtualized;
while others are not virtualized yet such as TM1, TM2, MCA and there are
some features which do not need virtualization such as MMX. With the
patch Guest sees only those processor features in the cpuid which are
virtualized in the hyper visor, or do not need any virtualization in
hypervisor.

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
Signed-off-by: Asit Mallick <asit.k.mallick@intel.com>