ARM: dts: sun9i: Change node names to remove underscores

Some boards have had node names with underscores. Remove them in favour of
hyphens in order to reduce the DTC warnings.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun9i-a80-cubieboard4.dts

@@ -74,7 +74,7 @@ red {
 		};
 	};
 
-	wifi_pwrseq: wifi_pwrseq {
+	wifi_pwrseq: wifi-pwrseq {
 		compatible = "mmc-pwrseq-simple";
 		clocks = <&ac100_rtc 1>;
 		clock-names = "ext_clock";

arch/arm/boot/dts/sun9i-a80-optimus.dts

@@ -98,7 +98,7 @@ reg_usb3_vbus: usb3-vbus {
 		gpio = <&pio 7 5 GPIO_ACTIVE_HIGH>; /* PH5 */
 	};
 
-	wifi_pwrseq: wifi_pwrseq {
+	wifi_pwrseq: wifi-pwrseq {
 		compatible = "mmc-pwrseq-simple";
 		clocks = <&ac100_rtc 1>;
 		clock-names = "ext_clock";