ARM: dts: sun8i: reference tablet design: Enable PMIC power supplies

The A23/A33 reference tablet design has a DC barrel tied to the ACIN
of the PMIC. And being a tablet, it has a Li-Po battery.

Enable both power supplies in the device tree.

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