msm: 8974: MHL Scratchpad interface implementation

MHL Scratchpad provides an interface for
the MHL peer devices to communicate with each other
Each device shall provide a sixteen
byte writeable memory space to its peer.
This change implements the scratchpad read and write
interfaces for MHL Tx chipset.

Change-Id: Ifaaa2e799424514ec68c8e4c7434f95a68261fe1
Signed-off-by: Manoj Rao <manojraj@codeaurora.org>
5 files changed