ARM: dts: sun8i: v40: bananapi-m2-berry: Add GPIO pin-bank regulator supplies

The bananapi-m2-berry has the PMIC providing voltage to all the pin-bank
supply rails from its various regulator outputs, tie them to the pio
node.

Signed-off-by: Pablo Greco <pgreco@centosproject.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>