drm/amd/display: fix dual cursor shows on extend desktop

drm/amd/display: fix dual cursor shows on extend desktop

[why & how]
when dpp pipe power gating disabled in driver, disable_pipe
did not disable cursor so next time as long as this pipe
powers up, it will be visible.

port dcn314 logic: disable cursor when it should be pipe pg.

Reviewed-by: Roman Li <roman.li@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>