arm64: dts: mt7986: add pwm-fan and cooling-maps to BPI-R3 dts

Add pwm-fan and cooling-maps to BananaPi-R3 devicetree.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230530201235.22330-5-linux@fw-web.de


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>