Input: omap-keypad: Remove dependencies to mach includes

Remove support for omap2+ as it's no longer needed since
it's using matrix-keypad. This way we can remove depency
to plat and mach headers which is needed for ARM common
zImage support.

Also remove INT_KEYBOARD by using omap_kp->irq.

Note that this patch depends on an earlier patch
"ARM: OMAP: Move gpio.h to include/linux/platform_data".

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Acked-by: Sourav Poddar <sourav.poddar@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index c50fa75..b4b65af 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -533,7 +533,7 @@
 
 config KEYBOARD_OMAP
 	tristate "TI OMAP keypad support"
-	depends on (ARCH_OMAP1 || ARCH_OMAP2)
+	depends on ARCH_OMAP1
 	select INPUT_MATRIXKMAP
 	help
 	  Say Y here if you want to use the OMAP keypad.