msm: mdss: add display-port hdcp's register set

Add HDCP 1.x related registers to be hooked up with
hdcp 1.x state machine so that hdcp 1.x can be programmed
to work for DP.

Change-Id: I16bf5ecbc237294e99ce6710c6b759e3346011a5
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>