drm/msm/dsi-staging: avoid sending panel off commands

During ESD recovery, we cannot ensure health of DSI
PHY link. Thus, sending ESD panel off commands may
subject to fail. Avoid sending panel off commands
when ESD recovery is underway.

Change-Id: I443c8b1044ad68ae3fc6e4b2a904134970ec8c18
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>