defconfig: msm: enable HDCP features for DisplayPort for lito

The changes remove stub function calls and enable Display
module to communicate with HDCP TrustZone application.

CRs-Fixed: 2452428
Change-Id: I112fdbdb729e7a6c2a1988e89716b240138b9964
Signed-off-by: Bhuvan Varshney <bvarshne@codeaurora.org>