This patch adds missing include of linux/types.h to fix below build error.

  CC      arch/arm/mach-mv78xx0/mpp.o
In file included from arch/arm/mach-mv78xx0/include/mach/gpio.h:9,
                 from /home/axel/repos/git/linux-2.6/arch/arm/include/asm/gpio.h:5,
                 from include/linux/gpio.h:18,
                 from arch/arm/mach-mv78xx0/mpp.c:10:
arch/arm/plat-orion/include/plat/gpio.h:28: error: expected declaration specifiers or '...' before 'u32'
make[1]: *** [arch/arm/mach-mv78xx0/mpp.o] Error 1
make: *** [arch/arm/mach-mv78xx0] Error 2
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Reviewed-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>