ARM: dts: sun6i: a31s: bpi-m2: improve pmic properties

The eldoin is supplied from the dcdc1 regulator. The N_VBUSEN pin is
connected to an external power regulator (SY6280AAC).
With this commit we update the pmic binding properties to support
those features.

Fixes: 7daa2137 ("ARM: dts: sunxi: Add regulators for Sinovoip BPI-M2")
Cc: <stable@vger.kernel.org>
Signed-off-by: NPhilipp Rossak <embed3d@gmail.com>
Signed-off-by: NMaxime Ripard <maxime.ripard@bootlin.com>

arch/arm/boot/dts/sun6i-a31s-sinovoip-bpi-m2.dts

@@ -163,6 +163,8 @@
 		reg = <0x68>;
 		interrupt-parent = <&nmi_intc>;
 		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+		eldoin-supply = <&reg_dcdc1>;
+		x-powers,drive-vbus-en;
 	};
 };