msm: camera: Add support for LED flash fast factory boot mode

Create torch-light node for i2c driven led flash device
and provide handle to fast mmi.

Change-Id: I19d79c2547b8d72f8d74a333c419b98e9093f0de
Signed-off-by: Lokesh Kumar Aakulu <lkumar@codeaurora.org>
Signed-off-by: Mayank Parashar <mayankp@codeaurora.org>