ARM: sun5i: chip: enable battery power supply subnode

The NextThing Co. CHIP has an AXP209 PMIC with battery connector.

This enables the battery power supply subnode.
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun5i-r8-chip.dts

@@ -132,6 +132,10 @@ &ac_power_supply {
 	status = "okay";
 };
 
+&battery_power_supply {
+	status = "okay";
+};
+
 &i2c1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&i2c1_pins_a>;