tegra: dc: ext: don't skip flips based on TS

tegra: dc: ext: don't skip flips based on TS

Currently if two timestamped flips are queued
with timestamps that aren't separated by vsync, the
older flip is skipped. This code path isn't actually
supported on Android. This change disables it.

Bug 1654135

Change-Id: I10afe0b98e044895aa47898ea64888b1d09966a8
Signed-off-by: Daniel Solomon <daniels@nvidia.com>
Reviewed-on: http://git-master/r/763740
(cherry picked from commit ba890cdcbb2d988b6f0bbbc18ef22c7ab74c59bc)
Reviewed-on: http://git-master/r/775803
Reviewed-by: Jon Mayo <jmayo@nvidia.com>
Tested-by: Jon Mayo <jmayo@nvidia.com>