drm/msm/sde: enable MISR during secure-ui session

Enable MISR before transitioning into secure mode and
disable it while transitioning back to non-secure mode
based on secure-ui-misr feature flag set in the catalog.
Add a vote on the core-clks to make sure all the resources
are up and ensuring there is no power-collapse during the
session, so MISR can be read throughout the session.

Change-Id: I18f4fb6f60b3a64b3c28b05525224a59b08055a9
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>