drm/msm/sde: fix to disable autorefresh from cont splash

With latest hw, autorefresh feature needs to be disabled
in the hw interface. This change makes sure that during
the continuous splash use case, the interface api's get
called to disable auto-refresh when required.

Change-Id: If4864443498efbba5b3c53478ec5a152672457a4
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>