msm: camera: Enable camera sub devices

 - Enabled driver to support flash eeprom actuator.
 - Added necessary changes to request irq and free irq.
 - Added necessary to fix the compilation for flash driver.

Change-Id: I0b97e234d9fc1809d745713724816bc55816cdc2
Signed-off-by: Gurram Pravalika <gpravali@codeaurora.org>