drm/amd/display: replace CRTC disable function call

[Why]

In OTG disable workarund, CRTC is disabled immediately
to improve performance, but this may cause timing issue
in DP HPO encoder FIFO and result in blank CRCs.

[How]

Replace the immediate CRTC disable call with normal disable call

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Xi (Alex) Liu <xi.liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>