Fix handling of multiple XDR certs in MfciDxe when the cert buffer address is not aligned itself

Fixes an issue where XDR certificates may not be correctly parsed in
MfciDxe - ValidateBlobWithXdrCertificates when the buffer
containing the certs is not aligned to a 4-byte boundary, even if
the certs are aligned within the buffer itself. The alignment should
be taked with respect to the start of the buffer, rather than the
absolute position in memory.

Author: Thomas Hinds

MfciPkg/MfciDxe/MfciDxe.c

@@ -667,8 +667,7 @@ ValidateBlobWithXdrCertificates (
       break;
     }
 
-    PublicKeyDataCurrent = PublicKeyData + PublicKeyDataLength;
-    PublicKeyDataCurrent = (UINT8 *)ALIGN_POINTER (PublicKeyDataCurrent, sizeof (UINT32));
+    PublicKeyDataCurrent = PublicKeyData + ALIGN_VALUE (PublicKeyDataLength, sizeof (UINT32));
   }
 
   // above is inspired/borrowed from FmpDxe.c