gpio: decouple the IOP GPIO driver from platform
gpio: decouple the IOP GPIO driver from platform

This removes the only dependence between the IOP GPIO
driver and the GENERIC_GPIO header in <mach/gpio.h>
and its common implementation in the <asm/*> namespace
by copying the one constant it is using into the driver
file.

Cc: Lennert Buytenhek <c65a0fb7e74ffd2c9fc3a0f9aacb0f6a24b0a68b@wantstofly.org>
Cc: Dan Williams <24ee2bf0bd8ac766c348bf1f0639943bac1535c6@intel.com>
Cc: Mikael Pettersson <5a121dcf2ef22469a1bfc77a94db5b725c29d263@it.uu.se>
Tested-by: Aaro Koskinen <13423a3f3006b5859cfceae66d59451f5eb4e205@iki.fi>
Signed-off-by: Linus Walleij <9cd9d802d23c0ed5e224beabf4ae4a5c478746ef@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs