msm: mdss: hdmi: cleanup ddc usage

Check for all possible DDC errors and clear the corresponding
acknowledge bit. Properly enable or disable the DDC interrupts
based on the requirements. Optimize DDC data structure by
removing unnecessary variables and keeping different DDC related
data under common structure. Move all DDC implementations to one
place.

Change-Id: If63479d5bc263db63e62d1846ab13a2659a83a68
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>