drm/msm/hdcp: fix clean up sequence for HDCP failures

Fix the clean up sequence for HDCP failures by ensuring
that the transport layer is updated with the latest status
and that all pending or currently executing threads that
might access the shared secure buffer are stopped. This
will prevent the access to the shared secure buffer once
the buffer is returned to the secure application layer
while closing the current session in the event of HDCP
failure.

CRs-Fixed: 2345060
Change-Id: I28e6e239bd85e12382242f0751dde47fe30a0e1d
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>