dt-bindings: Add MSM DSI controller documentation
dt-bindings: Add MSM DSI controller documentation

Signed-off-by: Hai Li <e16f2cfe3eeddac6a07d0579fc92925faf1d9f49@codeaurora.org>
Signed-off-by: Rob Clark <915c10c999604870200b6defbe633d857c856ca0@gmail.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs