drm/msm/sde: enable secure-ui-misr feature for sdm670/710 target

Enable the secure-ui-misr feature flag and add the blocked
xin-mask for sdm670/710 target. The blocked xin-mask defines
which xin-clients should be be blocked during secure-ui
session.

Change-Id: Ic498d215427bdd39068750687ec0e2b4654670cc
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>