msm: camera: SOC layer support for camera drivers

This patch adds the support for SOC layer which abstracts
all the external devices communication. By doing so
the camera drivers can be adaptable to any non msm
platforms.

Change-Id: Iad25aa59db377dbc70f53f5d77548b28b808f09f
Signed-off-by: Lakshmi Narayana Kalavala <lkalaval@codeaurora.org>