msm: mdss: hdcp_1x: remove obsolete code

Remove HLOS and TZ communication mechanism which is
using SCM APIs. New hardware supports programming in
HLOS itself. Also, communication is now handled by
qseecom APIs. This makes SCM code obsolete and redundant.
Remove any such code which is not being used in current
hardware.

Change-Id: I9b120b88f92be517d1734697625038b28b32feb1
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>