drm/msm: fix hdcp 1x module for repeater test cases

Remove the incorrect Ainfo transfer to the sink during the
start of repeater test cases for the HDMI HDCP 1x module.
This causes incorrect results from sinks which are repeaters.

Fix the logic to disable software DDC before going into
part3 of HDCP 1x authentication.

Change-Id: Iddf1c5804162ecd3919a0d4fedc9102e3b1778ed
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>