drm/msm/dsi-staging: avoid ulps entry while esd recovery is pending

When ESD recovery is pending, DSI PHY link will be in
an unresponsive state. Thus, any attempts to enter ulps
will fail.

Change-Id: Icebe7fa294f8d75ce854d82bc71f48a78a26fa79
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>