msm: mdss: hdmi: set max TMDS clock rate

Pxl clock frequency of every video timing parsed from EDID is
being checked against max TMDS clock rate supported by HDMI
controller without considering HDMI Sink's max TMDS clock rate.
HDMI Sink's max TMDS clock rate will be indicated in HDMI 1.4
VSDB or HDMI Forum VSDB if available. Set the minimum of HDMI
controller's and HDMI Sink's max TMDS clock rate and then check
if video timings are supported or not.

Change-Id: I9668f77edebc5de16d24e9892ba06f9f64f0f743
Signed-off-by: Narender Ankam <nankam@codeaurora.org>