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/pm24xx.c

@@ -35,12 +35,14 @@
 #include <asm/mach/irq.h>
 #include <asm/mach-types.h>
 
-#include <mach/irqs.h>
 #include <plat/clock.h>
 #include <plat/sram.h>
 #include <plat/dma.h>
 #include <plat/board.h>
 
+#include <mach/irqs.h>
+
+#include "iomap.h"
 #include "common.h"
 #include "prm2xxx_3xxx.h"
 #include "prm-regbits-24xx.h"
@@ -49,7 +51,6 @@
 #include "sdrc.h"
 #include "pm.h"
 #include "control.h"
-
 #include "powerdomain.h"
 #include "clockdomain.h"