MdeModulePkg FormBrowserEx: Change its structure name with EDKII_ prefix

EDKII implementation protocol should be with EDKII_ prefix.

V2: add gEdkiiFormBrowserExProtocolGuid to align its structure name.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>

MdeModulePkg/Universal/SetupBrowserDxe/Setup.c

@@ -938,7 +938,7 @@ InitializeSetup (
   
   Status = gBS->InstallProtocolInterface (
                   &mPrivateData.Handle,
-                  &gEfiFormBrowserExProtocolGuid,
+                  &gEdkiiFormBrowserExProtocolGuid,
                   EFI_NATIVE_INTERFACE,
                   &mPrivateData.FormBrowserEx
                   );