arm64: dts: hisilicon: hikey970-pmic: fix regulator cells properties

The Hi6421 PMIC regulator child nodes do not have unit addresses so drop
the incorrect '#address-cells' and '#size-cells' properties.

Fixes: 6219b20e ("arm64: dts: hisilicon: Add support for Hikey 970 PMIC")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hikey970-pmic.dtsi

@@ -25,9 +25,6 @@ pmic: pmic@0 {
 			gpios = <&gpio28 0 0>;
 
 			regulators {
-				#address-cells = <1>;
-				#size-cells = <0>;
-
 				ldo3: ldo3 { /* HDMI */
 					regulator-name = "ldo3";
 					regulator-min-microvolt = <1500000>;