ARM: shmobile: Remove romImage CONFIG_MEMORY_START

Instead of relying on CONFIG_MEMORY_START for memory
base address, let each romImage board header file
specify this information.

This is reworks code not to rely on CONFIG_MEMORY_START
which in turn is needed for ARCH_MULTIPLATFORM.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
diff --git a/arch/arm/boot/compressed/head-shmobile.S b/arch/arm/boot/compressed/head-shmobile.S
index 19b2304..e2d6363 100644
--- a/arch/arm/boot/compressed/head-shmobile.S
+++ b/arch/arm/boot/compressed/head-shmobile.S
@@ -46,7 +46,7 @@
 __image_end:
 	.long	_got_end
 __load_base:
-	.long	CONFIG_MEMORY_START + 0x02000000 @ Load at 32Mb into SDRAM
+	.long	MEMORY_START + 0x02000000 @ Load at 32Mb into SDRAM
 __loaded:
 	.long	__continue
 	.align