msm: mdss: enable burst mode for DSI command mode panels

Enable burst mode for DSI command mode panels, so that
dsi pixel data and dcs commands can be sent independent
of each other. In case of burst mode we don't need to
wait for DSI command transfer to complete before command
kickoff.

Conflicts:
	drivers/video/msm/mdss/mdss_dsi.c
	drivers/video/msm/mdss/mdss_dsi_host.c

Change-Id: I5777a72b8ad84a7929aa6e06849060efdebb0d7b
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>