drm/amd/display: bypass ODM before CRTC off

[WHY]
OPPs couldn't disconnect from the ODM that cause the double buffer pending not being latched due to missing VUPDATE.

[HOW]
Moving memory blanking before OTG turn off to make sure double buffer latched correctly.

Reviewed-by: Dmytro Laktyushkin <dmytro.laktyushkin@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: Yihan Zhu <yihan.zhu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>