drm/amd/display: Add dtb clock to dc_clocks

Reviewed-by: Ariel Bernstein <Eric.Bernstein@amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com>
Signed-off-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>