MIPS: Lantiq: Change ltq_request_gpio() call signature

MIPS: Lantiq: Change ltq_request_gpio() call signature

ltq_request_gpio() was using alt0/1 to multiplex the function of GPIO pins.
This was XWAY specific. In order to also accomodate SoCs that require more
bits we use a 32bit mask instead. This way the call signature is consistent
between XWAY and FALC-ON.

Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3252/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>