arm64: dts: allwinner: h6: PineH64 model B: Add bluetooth

PineH64 model B has wifi+bt combo module. Wifi is already supported, so
lets add also bluetooth node.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210110211606.3733056-1-jernej.skrabec@siol.net