MdeModulePkg: Change OPTIONAL keyword usage style

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3760

Update all use of ', OPTIONAL' to ' OPTIONAL,' for function params.

Cc: Andrew Fish <afish@apple.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>

MdeModulePkg/Universal/HiiDatabaseDxe/Database.c

@@ -3479,7 +3479,7 @@ EFIAPI
 HiiNewPackageList (
   IN CONST EFI_HII_DATABASE_PROTOCOL    *This,
   IN CONST EFI_HII_PACKAGE_LIST_HEADER  *PackageList,
-  IN CONST EFI_HANDLE                   DriverHandle, OPTIONAL
+  IN CONST EFI_HANDLE                   DriverHandle  OPTIONAL,
   OUT EFI_HII_HANDLE                    *Handle
   )
 {
@@ -4629,4 +4629,3 @@ HiiGetPackageListHandle (
 
   return EFI_NOT_FOUND;
 }
-