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>

arch/arm/mach-omap2/pm24xx.c

@@ -31,6 +31,8 @@
 #include <linux/gpio.h>
 #include <linux/platform_data/gpio-omap.h>
 
+#include <asm/fncpy.h>
+
 #include <asm/mach/time.h>
 #include <asm/mach/irq.h>
 #include <asm/mach-types.h>
@@ -38,8 +40,6 @@
 
 #include <plat-omap/dma-omap.h>
 
-#include "../plat-omap/sram.h"
-
 #include "soc.h"
 #include "common.h"
 #include "clock.h"
@@ -48,6 +48,7 @@
 #include "cm2xxx_3xxx.h"
 #include "cm-regbits-24xx.h"
 #include "sdrc.h"
+#include "sram.h"
 #include "pm.h"
 #include "control.h"
 #include "powerdomain.h"