drm/amd/display: populate hardware_release hook for dcn401

drm/amd/display: populate hardware_release hook for dcn401

[Description]
hardare_release() is called when driver is removed. Add the missing hook for DCN401

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>