msm: camera: CSI changes for 8974

This request has changes in CSI drivers to address hardware
changes between old platform and 8974. Add combo PHY
support in CSIPHY and CSID driver. In CSID, select
input from any CSIPHY core and add support for matching
platform device in device tree convention

Change-Id: I3d1d8eed56f0440db7a8a4864f1c63f098f4caa7
Signed-off-by: Hody Hung <hhung@codeaurora.org>