pinctrl: make pinmux disable function optional

Some SoCs may not have pinmux disable function in HW.

Change-Id: I04c0cc9639caa43c075284a4e1a24c8543f30c73
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Git-commit: 02b50ce4cb1b6aff7d9f1c0c5b4ceb44107bacb4
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Hanumant Singh <hanumant@codeaurora.org>
1 file changed