msm: 8974: MHL MSC/RCP/RAP feature implementation

MHL implementation in 8974 for handling CBUS interrupts to
enable and handle MSC translation control packets.
This change also includes implementation of RCP/RAP
protocols by registering MHL driver as input device
and building key code mapping.

Change-Id: I73e399bbbf9b2f53974225aaa8697fce2057d017
Signed-off-by: Manoj Rao <manojraj@codeaurora.org>
7 files changed