msm: camera: Reorganize power up functions for sensors

Moving regulators and gpio to board file
GPIO and regulators are usually different for OEM projects.
This will give them the flexibility to support multiple
devices without changing the driver.

Change-Id: I37549d2eaf3a6c31c1b7cf81270c2b22dde30011
Signed-off-by: Kevin Chan <ktchan@codeaurora.org>