CryptoPkg: Update OPTIONAL location for BaseCryptLibMbedTls

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=4740

There is a wrong usage for OPTIONAL.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Yi Li <yi1.li@intel.com>
Signed-off-by: Wenxing Hou <wenxing.hou@intel.com>
Reviewed-by: Yi Li <yi1.li@intel.com>

CryptoPkg/Library/BaseCryptLibMbedTls/Pk/CryptPkcs1OaepNull.c

@@ -38,10 +38,8 @@ Pkcs1v2Encrypt (
   IN   UINTN        PublicKeySize,
   IN   UINT8        *InData,
   IN   UINTN        InDataSize,
-  IN   CONST UINT8  *PrngSeed,
-  OPTIONAL
-  IN   UINTN        PrngSeedSize,
-  OPTIONAL
+  IN   CONST UINT8  *PrngSeed  OPTIONAL,
+  IN   UINTN        PrngSeedSize  OPTIONAL,
   OUT  UINT8        **EncryptedData,
   OUT  UINTN        *EncryptedDataSize
   )