msm: camera: isp: Add support for PLAIN128 format over RDI

Add PLAIN128 as acceptable format for unpacked data transfer
over RDI and configure the RDI Bus WM to frame based and the
appropriate width and height.

Change-Id: I00e730a57b12a1f5fe1348ebf9cc2e4aa902b202
Signed-off-by: Harsh Shah <harshs@codeaurora.org>