msm:camera: change to add the gpio control Vreg enable

Some auto focus module has PWDM pin to be enabled by gpio, and we
also need to add gpio enable vreg to support different customers.

Change-Id: Id9b230c855a7665697d1ddc80fa845e44ba6f4b0
Signed-off-by: feim <Flynn@codeaurora.org>
4 files changed