ARM: OMAP: Split sram.h to local headers and minimal shared header

Most of the defines are specific to omap1 and omap2+,
and should be in the local headers. Only minimal function
prototypes need to be shared.

As discussed on linux-arm-kernel, we want to avoid
relative includes for the arch/arm/*omap* shared code:

http://www.spinics.net/lists/linux-omap/msg80520.html

So this patch re-adds a minimal plat/sram.h.

The new plat/sram.h must not be included from drivers,
that will break build for omap2+ CONFIG_MULTIPLATFORM.

Note that this patch temporarily adds two more
relative includes; Those will be removed in the
following patch.

Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap1/devices.c b/arch/arm/mach-omap1/devices.c
index 645668e..7155ed8 100644
--- a/arch/arm/mach-omap1/devices.c
+++ b/arch/arm/mach-omap1/devices.c
@@ -26,12 +26,11 @@
 #include <mach/camera.h>
 #include <mach/hardware.h>
 
-#include "../plat-omap/sram.h"
-
 #include "common.h"
 #include "clock.h"
 #include "dma.h"
 #include "mmc.h"
+#include "sram.h"
 
 #if defined(CONFIG_SND_SOC) || defined(CONFIG_SND_SOC_MODULE)