pinctrl: qcom: increase variable size for register offsets

On newer TLMM hardware blocks the registers are spread and
we need an offsets upper than 16 bits to address them. Increase
the register offset variables to 32 bits size.

Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>