drm/msm/hdcp: update hdcp 2.2 stream management sequence

When HDCP stream management needs to be re-performed, the SDE_HDCP state
machine breaks down and reads or writes to the wrong DPCD HDCP offsets.
This results in an authentication failure, effectively allowing stream
management to succeed only on the first attempt.

Update the SDE_HDCP stream management logic to properly take its current
state into account in re-management scenarios. This will reduce the need
for full re-authentications upon content type updates.

Change-Id: Iebefbb060e49a7082b2d4c9efbed22a83a2a5ec5
Signed-off-by: Christopher Braga <cbraga@codeaurora.org>