drm/msm/dsi-staging: add software simulation states to esd check mode

Add software simulate success/failure modes to debugfs node
esd_check_mode while reading current mode.

Change-Id: I7534083c87855cd248d141788f20cdcf3ef8dc78
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>