hikey960:Corrected erroneous DDR_SIZE

Change-Id: I7194a9a5f0e41308eb3242d20c0d3434f72da591
Signed-off-by: Joel Hutton <Joel.Hutton@Arm.com>

plat/hisilicon/hikey960/hikey960_def.h

@@ -11,7 +11,7 @@
 #include <plat/common/common_def.h>
 
 #define DDR_BASE			0x0
-#define DDR_SIZE			0xC0000000
+#define DDR_SIZE			0xE0000000
 
 #define DEVICE_BASE			0xE0000000
 #define DEVICE_SIZE			0x20000000