ARM: iop: fix mismerge of Kconfig

I mismerged one of the branches that moves around gpio header file usage,
and messed up for IOP. This fixes the obvious compilation failures caused
by it.
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/Kconfig

@@ -491,7 +491,6 @@ config ARCH_IOP32X
 	depends on MMU
 	select CPU_XSCALE
 	select NEED_MACH_GPIO_H
-	select NEED_MACH_IO_H
 	select NEED_RET_TO_USER
 	select PLAT_IOP
 	select PCI
@@ -505,7 +504,6 @@ config ARCH_IOP33X
 	depends on MMU
 	select CPU_XSCALE
 	select NEED_MACH_GPIO_H
-	select NEED_MACH_IO_H
 	select NEED_RET_TO_USER
 	select PLAT_IOP
 	select PCI