MLK-18844: drm: imx: dcss: lower mode change time
Currently, there's a hardcoded wait time (500ms) after enabling DTG
clocks. This is supposed to avoid VBLANK timeout warning messages.
However, this time is quite big. This patch changes this by lowering this
time as much as possible, with the use of completion events. After
enabling CRTC we just block until the first VBLANK interrupt comes. This
way, we know for sure that we'll never get a VBLANK timeout.
Signed-off-by: Laurentiu Palcu <laurentiu.palcu@nxp.com>
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