ARM: dts: at91: sama5d4_xplained: fix regulator names

vcc_3v3_reg and vcc_mmc1_reg are fixed regulators and don't need a reg
property. Remove their unit-address.

Solves:
Warning (unit_address_vs_reg): Node /fixedregulator@0 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /fixedregulator@1 has a unit name, but no reg property
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/boot/dts/at91-sama5d4_xplained.dts

@@ -252,7 +252,7 @@ d10 {
 		};
 	};
 
-	vcc_3v3_reg: fixedregulator@0 {
+	vcc_3v3_reg: fixedregulator_3v3 {
 		compatible = "regulator-fixed";
 		regulator-name = "VCC 3V3";
 		regulator-min-microvolt = <3300000>;
@@ -261,7 +261,7 @@ vcc_3v3_reg: fixedregulator@0 {
 		regulator-always-on;
 	};
 
-	vcc_mmc1_reg: fixedregulator@1 {
+	vcc_mmc1_reg: fixedregulator_mmc1 {
 		compatible = "regulator-fixed";
 		gpio = <&pioE 4 GPIO_ACTIVE_LOW>;
 		regulator-name = "VDD MCI1";