msm: mdss: hdmi: unload HDCP 2.2 TZ app when resetting

Whenever we disconnect HDMI or are performing a
reauthentication of HDCP 2.2, unload the HDCP
2.2 TZ app so the state of the app is completely
reset.

Change-Id: I4696c373b027e38eaa95a345c65a61c1d7f1bd2d
Signed-off-by: Casey Piper <cpiper@codeaurora.org>