drm/amd/display: move definition of dc_flip_addrs struct

[Why & How]
Move definition of dc_flip_addrs struct from dc.h to dc_hw_types.h to
prevent build errors

Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Josip Pavic <Josip.Pavic@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>