drm/msm/hdcp: Update HDCP QSEECOM to start auth on user command

Split HDCP QSEECOM interface to separate authentication start
from library initialization. Update DP and SDE driver code to
conform to this new interface.

Change-Id: I4780f41cba6b08e6b4a139c0fbe324ec8be803f7
Signed-off-by: Shivaprasad Hongal <shongal@codeaurora.org>
Signed-off-by: Christopher Braga <cbraga@codeaurora.org>