drm/amd/display: use CRTC_VERTICAL_INTERRUPT0 as a trigger for VBLANK.

Register ISR hnadler on the new interrupt.

Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>