msm: mdss: hdmi: keep a default resolution for edid parser

Reset supported HDMI resolutions list to contain at least
a default resolution on EDID parser initialization and on
each parser call. In corner cases of EDID read or parser
failures, driver should expose a default resolution to
other modules to continue with the HDMI initialization.

Change-Id: I75cb78577d327c0f042238e10379585111d8fd70
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>