msm: mdss: hdmi: separate out hdcp library from hdmi

Define APIs to start or stop authentication from client.
Handle internal states within HDCP library and do not
call HDCP library internal functions directly from client.
Remove unnecessary threads and locks and execute on same
thread as standard requires this to be processed sequentially.

Change-Id: I4cd924fb836e0e01ff1d6eba58d817fe0ca383e1
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>