drm/amd/display: Enable Replay for DCN315

[why & how]
Enable Replay for DCN315.

Reviewed-by: Robin Chen <robin.chen@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Joan Lee <joan.lee@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>