clean-up: remove duplicate headers in OMAP

Removing duplicate headers in OMAP:
arch/arm/mach-omap1/board-palmtt.c: linux/input.h is included more than once.
arch/arm/mach-omap1/board-osk.c: linux/interrupt.h is included more than once.
arch/arm/mach-omap1/board-palmz71.c: linux/input.h is included more than once.
arch/arm/mach-omap1/board-nokia770.c: asm/arch/dsp_common.h is included more than once.
arch/arm/mach-omap1/board-nokia770.c: asm/arch/gpio.h is included more than once.
arch/arm/mach-omap2/pm.c: asm/arch/gpio.h is included more than once.

Signed-off-by: Francisco Alecrim <francisco.alecrim@indt.org.br>
Signed-off-by: Tony Lindgren <tony@atomide.com>