msm: mdss: increase wait for kickoff timeout in display thread

Increase wait for kickoff timeout to accomodate system delays
in display commit thread. In the current implementation, there is
a possibility that unsignalled fences are flushed to display on the
panel. Hence update mixer stage to border color to avoid displaying
unsignalled fences.

Change-Id: I005ac5ccec001d167d65810b6c68f788794985b8
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>