KVM: x86: expose Intel cpu new features (HLE, RTM) to guest

Intel recently release 2 new features, HLE and RTM.
Refer to http://software.intel.com/file/41417

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This patch expose them to guest.

Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>