msm: camera: sensor: support more gpio pin types

GPIO pins are used for i/o power(vio), actuator power(vaf)
and analog power(vana) in new targets. To support new GPIO
pin types in the device tree, device tree parsing is added
for pin types:
   gpio-vio
   gpio-vaf
   gpio-vana

Change-Id: Ibebf8f95f4d1d26c44a820203b9b58bf1154a766
Signed-off-by: Xu Han <hanxu@codeaurora.org>