[Description]:

Add a feature flag in Uhci & Ehci to disable legacy USB SMI.
[Impaction]:
  Platform integrator can choose to legacy USB SMI or not.
[Reference Info]
  EDK Tracker 1082

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5081 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Bus/Pci/EhciDxe/EhciDxe.inf

@@ -49,7 +49,10 @@
 
 [Packages]
   MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
 
+[FeaturePcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdUsbLegacySupport
 
 [LibraryClasses]
   MemoryAllocationLib
@@ -59,7 +62,7 @@
   UefiDriverEntryPoint
   BaseMemoryLib
   DebugLib
-
+  PcdLib
 
 [Protocols]
   gEfiPciIoProtocolGuid                         # PROTOCOL ALWAYS_CONSUMED