msm: camera: Add reading cci device index from parent node

Subdev node define under cci node can read cci index from parent.
This cci index number is needed for cci framework to pick correct
hardware.

Change-Id: Ic6a45b3dc6f4f7d49a96bef337c54998d815129a
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>