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

plat/arm/board/fvp/fvp_common.c

@@ -189,6 +189,7 @@ void fvp_config_setup(void)
 		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);

plat/arm/board/fvp/fvp_def.h

@@ -105,6 +105,7 @@
 #define REV_FOUNDATION_FVP_V2_0		0x0
 #define REV_FOUNDATION_FVP_V2_1		0x1
 #define REV_FOUNDATION_FVP_v9_1		0x2
+#define REV_FOUNDATION_FVP_v9_6		0x3
 
 #define BLD_GIC_VE_MMAP			0x0
 #define BLD_GIC_A53A57_MMAP		0x1