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/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c
index c1bf3ef..deffbf1 100644
--- a/arch/arm/mach-omap2/omap-smp.c
+++ b/arch/arm/mach-omap2/omap-smp.c
@@ -23,11 +23,12 @@
 #include <asm/cacheflush.h>
 #include <asm/hardware/gic.h>
 #include <asm/smp_scu.h>
+
 #include <mach/hardware.h>
 #include <mach/omap-secure.h>
 
+#include "iomap.h"
 #include "common.h"
-
 #include "clockdomain.h"
 
 /* SCU base address */