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>
diff --git a/arch/arm/mach-omap2/sram242x.S b/arch/arm/mach-omap2/sram242x.S
index ff9b9db..ee0bfcc 100644
--- a/arch/arm/mach-omap2/sram242x.S
+++ b/arch/arm/mach-omap2/sram242x.S
@@ -29,10 +29,12 @@
  * These crashes may be intermittent.
  */
 #include <linux/linkage.h>
+
 #include <asm/assembler.h>
-#include <mach/io.h>
+
 #include <mach/hardware.h>
 
+#include "iomap.h"
 #include "prm2xxx_3xxx.h"
 #include "cm2xxx_3xxx.h"
 #include "sdrc.h"