msm: camera: sensor: Adjust pinctrl control flow

Some devices don't have the pinctrl configuration,
but they may have the shared resource, so we always
need to control the shared pinctrl during power on
and power off.

Change-Id: I72c65c441a6bac63b0b17ac847f874f354cfca0f
Signed-off-by: Depeng Shao <depengs@codeaurora.org>