ARM: dts: sun8i: a83t: bananapi-m3: Add LED device nodes

The Bananapi M3 has two controllable LEDs, blue and green, that are tied
to the PMIC's two GPIO pins.

Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>