ARM: OMAP: GPIO: Fix valid range and enable usage of all GPIOs on OMAP5

The omap_gpio driver is used by AM33XX, OMAP3/4, OMAP54XX and DRA7XX SoCs.
These SoCs have different gpio count but currently omap_gpio driver uses hard
coded 192 which is wrong.

This patch fixes this issue by:
1. Move define of OMAP_MAX_GPIO to all arch/arm/include/asm/arch-omap*/gpio.h.
2. Update gpio bank settings and enable GPIO modules 7 & 8 clocks for OMAP5.

Thanks for Lubomir Popov to provide valuable comments to fix this issue.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Tested-by: Lubomir Popov <lpopov@mm-sol.com>
Acked-by: Heiko Schocher <hs@denx.de>
diff --git a/arch/arm/include/asm/arch-omap3/gpio.h b/arch/arm/include/asm/arch-omap3/gpio.h
index 8bba3b0..d72f5e5 100644
--- a/arch/arm/include/asm/arch-omap3/gpio.h
+++ b/arch/arm/include/asm/arch-omap3/gpio.h
@@ -40,6 +40,8 @@
 
 #include <asm/omap_gpio.h>
 
+#define OMAP_MAX_GPIO			192
+
 #define OMAP34XX_GPIO1_BASE		0x48310000
 #define OMAP34XX_GPIO2_BASE		0x49050000
 #define OMAP34XX_GPIO3_BASE		0x49052000