msm: mdss: hdmi: add new resolutions at runtime

EDID (Extended Display Identification Data) may contain some
resolutions in DTDs (Detailed Timing Descriptors) which are not
in the supported resolutions list. In such cases, every time
when the HDMI cable is connected, parse all the resolution data
from DTD and populate the resolution list with the newly found
resolution. This way any resolution found in DTD can be supported
subjected to hardware limitations.

Change-Id: Ib2223e34820a70da0b03b8ac39b170cf6b3e65b5
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>