ARM: OMAP2+: Move most of plat/io.h into local iomap.h

There's no need to have these defines in plat/io.h.

Note that we now need to ifdef omap_read/write calls
as they will be available for omap1 only.

While at it, clean up the includes to group them like
they typically are grouped.

Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/sleep34xx.S

@@ -23,10 +23,12 @@
  * MA 02111-1307 USA
  */
 #include <linux/linkage.h>
-#include <asm/assembler.h>
-#include <plat/sram.h>
-#include <mach/io.h>
 
+#include <asm/assembler.h>
+
+#include <plat/sram.h>
+
+#include "iomap.h"
 #include "cm2xxx_3xxx.h"
 #include "prm2xxx_3xxx.h"
 #include "sdrc.h"