Revert "drm/exynos: decon: use deferred Trigger mode change"

Revert "drm/exynos: decon: use deferred Trigger mode change"

Since HWTRIGGER can be enabled early this patch is not needed anymore.
Reverted patch complicates code and makes debugging more difficult -
DECON works in two different modes before and after suspend.
Since we have full control over all pipe components and we do full
configuration we can switch between HW/SW trigger without waiting
for platform suspend/resume.

This reverts commit 7a0e6fa3d120793a16b6bb16951ef2c436505080.

Change-Id: Ibe401305b9e80b70d9fcc8339cf2a9c40167879d
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>