msm: mdss: hdcp: synchronize HDCP1 qseecom commands

HDCP driver tries to send two different HDCP1
commands concurrently which leads to XPU violation.
Synchronize HDCP1 qseecom command transfer calls.

Change-Id: I829cc9aff6589c0b816337946e6044bc9d450cc3
Signed-off-by: Narender Ankam <nankam@codeaurora.org>
Signed-off-by: Ramendra Kumar <ramendra@codeaurora.org>