drm/msm/dsi-staging: set correct state for status check command

In the current implementation dsi driver is always sending the
status check command in HS mode. This change fixes the issue by
setting the proper state based on panel device tree entry, before
sending the status check command from dsi host.

Change-Id: I9e8ed8616295de2a2f1d5fa2a8a83b706c70f033
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>