msm: mdss: hdmi: add support for hdmi simulation

Some sinks may not support DDC (Display Data Channel),
EDID (Extended Display Identification Data), Hot Plug
or a standard resolution. Add support to control these
functionalities from user modules to support these
hardware specific requirements.

Change-Id: I0340ccab35bbdddd63ef62fb4029d665641780a9
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>