MdeModulePkg: Add more PciHostBridgeLib gmock support

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>

MdeModulePkg/Test/MdeModulePkgHostTest.dsc

@@ -53,3 +53,8 @@
       UefiSortLib|MdeModulePkg/Library/UefiSortLib/UefiSortLib.inf
       DevicePathLib|MdePkg/Library/UefiDevicePathLib/UefiDevicePathLib.inf
   }
+
+  #
+  # Build HOST_APPLICATION Libraries
+  #
+  MdeModulePkg/Test/Mock/Library/GoogleTest/MockPciHostBridgeLib/MockPciHostBridgeLib.inf