SecurityPkg: 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: Jian J Wang <jian.j.wang@intel.com>

SecurityPkg/Library/DxeImageAuthenticationStatusLib/DxeImageAuthenticationStatusLib.c

@@ -32,7 +32,7 @@ EFI_STATUS
 EFIAPI
 DxeImageAuthenticationStatusHandler (
   IN  UINT32                           AuthenticationStatus,
-  IN  CONST EFI_DEVICE_PATH_PROTOCOL   *File, OPTIONAL
+  IN  CONST EFI_DEVICE_PATH_PROTOCOL   *File  OPTIONAL,
   IN  VOID                             *FileBuffer,
   IN  UINTN                            FileSize,
   IN  BOOLEAN                          BootPolicy