msm: mdss: hdmi: increase maximum edid read retries

Some HDMI sinks may not have EDID ready immediately
after asserting HPD. Increasing the maximum number of
read retries of the first EDID block to ensure that
EDID read is successful.

Change-Id: Ia8e49f3e8f6beca84ecb584dcb40446a8657edb0
Signed-off-by: Casey Piper <cpiper@codeaurora.org>