Not all bits of a register are used for pinctrl in SPEAr. So only update bits
relevant to pinctrl using muxreg->mask.
Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>