FmpDevicePkg: 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>

FmpDevicePkg/Library/FmpDependencyCheckLibNull/FmpDependencyCheckLibNull.c

@@ -31,7 +31,7 @@ EFIAPI
 CheckFmpDependency (
   IN  EFI_GUID                ImageTypeId,
   IN  UINT32                  Version,
-  IN  EFI_FIRMWARE_IMAGE_DEP  *Dependencies,    OPTIONAL
+  IN  EFI_FIRMWARE_IMAGE_DEP  *Dependencies     OPTIONAL,
   IN  UINT32                  DependenciesSize,
   OUT UINT32                  *LastAttemptStatus OPTIONAL
   )