dts: espressobin_ultra: fix wifi 8997 not working issue

the espressobin ultra board is inherit from espressobin board,
so the espressobin_ultra.dts includes espressobin.dtsi, but MPP1_4
is use to control wifi(88w8997) power down pin, not supply voltage
switch of sdcard (the 'vcc_sd1' regulator is for espressobin, not
espressobin ultra), it causes wifi(88w8997) power shutdown after
turn off vqmmc-supply, so remove the 'vcc_sd_reg1' regulator and
vqmmc-supply settings from espressobin_ultra.dts to make the wifi
(88w8997) working correctly.

arch/arm64/boot/dts/marvell/armada-3720-espressobin-ultra.dts

@@ -24,6 +24,8 @@
 		ethernet5 = &switch0port4;
 	};
 
+	/delete-node/ regulator;
+
 	reg_usb3_vbus: usb3-vbus {
 		compatible = "regulator-fixed";
 		regulator-name = "usb3-vbus";
@@ -66,6 +68,7 @@
 };
 
 &sdhci1 {
+	/delete-property/ vqmmc-supply;
 	status = "disabled";
 };