REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4443
Add Google Mock Library for PciHostBridgeLib
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Chris Johnson <chris.n.johnson@intel.com>
Signed-off-by: Gua Guo <gua.guo@intel.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>