arm64: dts: allwinner: h6: tanix-tx6: Enable bluetooth

Tanix TX6 comes either with RTL8822BS or RTL8822CS wifi+bt combo module.
Wifi part is already enabled in tanix DTSI. Let's enable also bluetooth.

Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>