drm/msm/dsi-staging: remove display from active list

Remove display from active list if it is selected from
command line instead of dtsi. This will avoid boot failure
for display configuration from dtsi and select valid display
as primary display.

Change-Id: I7da2d42d584a4b8dda174bc50d319f711b69f5e0
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>