UefiCpuPkg: 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: Ray Ni <ray.ni@intel.com>

UefiCpuPkg/Library/CpuCommonFeaturesLib/FastStrings.c

@@ -30,7 +30,7 @@ EFIAPI
 FastStringsInitialize (
   IN UINTN                             ProcessorNumber,
   IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
-  IN VOID                              *ConfigData,  OPTIONAL
+  IN VOID                              *ConfigData   OPTIONAL,
   IN BOOLEAN                           State
   )
 {