vexpress64: Juno: Declare all 8GB of RAM and make them visible to the kernel.

Juno comes with 8GB RAM, but U-Boot only passes 2GB to the kernel.
Declare a secondary memory bank and set the sizes correctly.

Signed-off-by: Liviu Dudau <Liviu.Dudau@foss.arm.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Ryan Harkin <ryan.harkin@linaro.org>
Tested-by: Ryan Harkin <ryan.harkin@linaro.org>
diff --git a/include/configs/vexpress_aemv8a.h b/include/configs/vexpress_aemv8a.h
index ef3014d..0f2f1a3 100644
--- a/include/configs/vexpress_aemv8a.h
+++ b/include/configs/vexpress_aemv8a.h
@@ -168,11 +168,13 @@
 #define CONFIG_SYS_LOAD_ADDR		(V2M_BASE + 0x10000000)
 
 /* Physical Memory Map */
-#define CONFIG_NR_DRAM_BANKS		1
+#define CONFIG_NR_DRAM_BANKS		2
 #define PHYS_SDRAM_1			(V2M_BASE)	/* SDRAM Bank #1 */
+#define PHYS_SDRAM_2			(0x880000000)
 /* Top 16MB reserved for secure world use */
 #define DRAM_SEC_SIZE		0x01000000
 #define PHYS_SDRAM_1_SIZE	0x80000000 - DRAM_SEC_SIZE
+#define PHYS_SDRAM_2_SIZE	0x180000000
 #define CONFIG_SYS_SDRAM_BASE	PHYS_SDRAM_1
 
 /* Enable memtest */