ARM: dts: sun7i: bananapi: Add GPIO banks regulators

The bananapi has all its bank regulators tied to the 3v3 static regulator.
Make sure it's properly represented.
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm/boot/dts/sun7i-a20-bananapi.dts

@@ -191,6 +191,11 @@ &otg_sram {
 };
 
 &pio {
+	vcc-pa-supply = <&reg_vcc3v3>;
+	vcc-pc-supply = <&reg_vcc3v3>;
+	vcc-pe-supply = <&reg_vcc3v3>;
+	vcc-pf-supply = <&reg_vcc3v3>;
+	vcc-pg-supply = <&reg_vcc3v3>;
 	gpio-line-names =
 		/* PA */
 		"ERXD3", "ERXD2", "ERXD1", "ERXD0", "ETXD3",