mdss: display: Add support for variable refresh rate

Add support for variable refresh rate by changing the
VFP immediately and programming it to MDP TG and
DSI registers.

Change-Id: I186e80cf38d42f4224afedadda96cc613ae68470
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
6 files changed