drm/amd/display: fix an error check condition for synced pipes

Checking for disabled master pipe on a timing synchronized pipe is
incorrect in the case of ODM combine. This case is acceptable as long as
the disabled master pipe is part of the ODM tree. Skip printing error
message if this condition holds true.

Tested-by: Daniel Wheeler <Daniel.Wheeler@amd.com>
Reviewed-by: Dillon Varone <Dillon.Varone@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>