ARM: OMAP: Move gpio.h to include/linux/platform_data

This way we can remove includes of plat/gpio.h which won't work
with the single zImage support.

Note that we also remove the cpu_class_is_omap2() check
in gpio-omap.c as the drivers should not call it as we need to
make it local to arch/arm/mach-omap2 for single zImage support.

While at it, arrange the related includes in the standard way.

Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: linux-mtd@lists.infradead.org
Cc: alsa-devel@alsa-project.org
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
index c9e3820..5820c73 100644
--- a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
@@ -15,6 +15,7 @@
  * XXX these should be marked initdata for multi-OMAP kernels
  */
 #include <linux/power/smartreflex.h>
+#include <linux/platform_data/gpio-omap.h>
 
 #include <plat/omap_hwmod.h>
 #include <mach/irqs.h>
@@ -24,7 +25,6 @@
 #include <plat/l3_3xxx.h>
 #include <plat/l4_3xxx.h>
 #include <plat/i2c.h>
-#include <plat/gpio.h>
 #include <plat/mmc.h>
 #include <plat/mcbsp.h>
 #include <plat/mcspi.h>