msm: camera: Add shared clk support

Manage the shared clk's pinctrl in camera resource
manager module.
Some devices need to share same clk between sensor
and ois device, and these devices need to be opened
together in dual camera usecase, add shared clk
support for this situation.

Change-Id: I301ce19287b4cf10c5f04f2ebffe440bd96dd1e7
Signed-off-by: Depeng Shao <depengs@codeaurora.org>