plat/arm: fvp: Implement methods to retrieve soc-id information

Implemented platform functions to retrieve the soc-id information
for FVP platform.

Change-Id: Id3df02ab290a210310e8d34ec9d706a59d817517
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/plat/arm/board/fvp/fvp_def.h b/plat/arm/board/fvp/fvp_def.h
index c5d1568..4efe692 100644
--- a/plat/arm/board/fvp/fvp_def.h
+++ b/plat/arm/board/fvp/fvp_def.h
@@ -27,6 +27,11 @@
 #define FVP_CCI			1
 #define FVP_CCN			2
 
+/******************************************************************************
+ * Definition of platform soc id
+ *****************************************************************************/
+#define FVP_SOC_ID      0
+
 /*******************************************************************************
  * FVP memory map related constants
  ******************************************************************************/