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/Tpm2CommandLib/Tpm2Integrity.c

@@ -566,7 +566,7 @@ Done:
 EFI_STATUS
 EFIAPI
 Tpm2PcrAllocateBanks (
-  IN TPM2B_AUTH                *PlatformAuth,  OPTIONAL
+  IN TPM2B_AUTH                *PlatformAuth   OPTIONAL,
   IN UINT32                    SupportedPCRBanks,
   IN UINT32                    PCRBanks
   )