ARM: OMAP: Move omap2+ specific parts of sram.c to mach-omap2

Let's make the omap2+ specific parts private to mach-omap2.

This leaves just a minimal shared code into plat-omap like
it should be.

Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index 8a7fc04..3cfcd41 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -32,6 +32,7 @@
 #include "hsmmc.h"
 #include "omap4-sar-layout.h"
 #include "omap-secure.h"
+#include "sram.h"
 
 #ifdef CONFIG_CACHE_L2X0
 static void __iomem *l2cache_base;