Whitelist version 9.6 of Foundation FVP

This prevents a warning being emitted in the console during FVP
configuration setup when using the Foundation FVP 9.6 onwards.

Change-Id: I685b8bd0dbd0119af4b0cb3f7d708fcc08e99561
diff --git a/plat/arm/board/fvp/fvp_common.c b/plat/arm/board/fvp/fvp_common.c
index fbbe34e..3df472c 100644
--- a/plat/arm/board/fvp/fvp_common.c
+++ b/plat/arm/board/fvp/fvp_common.c
@@ -189,6 +189,7 @@
 		case REV_FOUNDATION_FVP_V2_0:
 		case REV_FOUNDATION_FVP_V2_1:
 		case REV_FOUNDATION_FVP_v9_1:
+		case REV_FOUNDATION_FVP_v9_6:
 			break;
 		default:
 			WARN("Unrecognized Foundation FVP revision %x\n", rev);