ANDROID: pinctrl: qcom: Allow pinctrl-msm code to be loadable as a module

Tweaks to allow pinctrl-msm code to be loadable as a module.
This is needed in order to support having the qcom-scm driver,
which pinctrl-msm calls into, configured as a module.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Bug: 153049053
Bug: 158125476
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: Ie5dac6955af029f0d57ad0bbcad2e235f8d5a52c