arm64: dts: mt7986: set Wifi Leds low-active for BPI-R3

Leds for Wifi are low-active, so add property to devicetree.

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/20230205174833.107050-1-linux@fw-web.de


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