msm: mdss: hdmi: turn on DDC when turn on hdmi

When HDMI is primary and at display timeout, DDC is turned off.
When resume, there is no hpd interrupt, need turn on DDC
for HDCP and EDID when turning on HDMI.

Change-Id: I2c6a8212261ca1f8dee5c6823670e221b6c83b5c
Signed-off-by: Ken Zhang <kenz@codeaurora.org>