msm_fb: MHL: MSC, RCP/RAP feature implementation

MHL implementation of handling CBUS interrupts to
enable and handle MSC translation control packets.
This change also includes implementation of RCP/RAP
protocols with place holders in MHL driver.

Change-Id: Icfc31ee1cf71a57cb9b3733d068ea4478b6c4e90
Signed-off-by: Manoj Rao <manojraj@codeaurora.org>
Signed-off-by: Abhishek Kharbanda <akharban@codeaurora.org>