vc/amd/agesa/f14: Add missing break statement

We do not want to ASSERT(FALSE).

Found-by: Coverity Scan, CID 1241850 (MISSING_BREAK)
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Change-Id: Ia08bb519cdb5ef5d2a79898706c7fac7e58adf3f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32180
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/vendorcode/amd/agesa/f14/Proc/Mem/NB/mnS3.c

@@ -792,6 +792,7 @@ MemNS3GetSetBitField (
         break;
       case AccessS3SaveWidth32:
         RegValue = *(UINT32 *) Value;
+	break;
       default:
         ASSERT (FALSE);
       }