platform: msm_shared: add MDP support for HDMI

Setup pipe, mixer, DSPP and TG for HDMI interface. Currently
only one interface can be active in LK. If HDMI is selected as
primary, LK will boot with HDMI as only interface.

Change-Id: I37c08ccf911d7a1daa065436c617c2c6c7101a4d
4 files changed