msm: camera: sensor: Read gpios property from dt node

Currently cam-res-mgr uses the virtual gpio number (A global gpio number
among all the gpio modules) in case of shared gpio. We cannot know this
upfront as the mapping varies between targets. This change allows to use
the shared gpios using gpios property, where we can mention the gpio module
and the gpio number used.

CRs-Fixed: 2994159
Change-Id: Ic60eeace89e5223eaeee5a7709bb3beee4127bb0
Signed-off-by: Tony Lijo Jose <tjose@codeaurora.org>