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/board-zoom-display.c b/arch/arm/mach-omap2/board-zoom-display.c
index 28187f1..d64f35f 100644
--- a/arch/arm/mach-omap2/board-zoom-display.c
+++ b/arch/arm/mach-omap2/board-zoom-display.c
@@ -18,6 +18,8 @@
 #include <video/omapdss.h>
 #include <mach/board-zoom.h>
 
+#include <plat/cpu.h>
+
 #define LCD_PANEL_RESET_GPIO_PROD	96
 #define LCD_PANEL_RESET_GPIO_PILOT	55
 #define LCD_PANEL_QVGA_GPIO		56