ARM: dts: imx: Remove 'compatible' from the pfuze nodes

Passing the 'compatible' property inside the pfuze100 regulator nodes
is not allowed per pfuze100.yaml and results in the following
warning:

imx6q-bosch-acc.dtb: pmic@8: regulators:sw3a: Unevaluated properties are not allowed ('compatible' was unexpected)

Remove it.
Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/nxp/imx/imx6q-bosch-acc.dts

@@ -314,7 +314,6 @@ sw2_reg: sw2 {
 			};
 
 			sw3a_reg: sw3a {
-				compatible = "regulator-fixed";
 				regulator-name = "DDR_1V5a";
 				regulator-boot-on;
 				regulator-always-on;
@@ -322,7 +321,6 @@ sw3a_reg: sw3a {
 			};
 
 			sw3b_reg: sw3b {
-				compatible = "regulator-fixed";
 				regulator-name = "DDR_1V5b";
 				regulator-boot-on;
 				regulator-always-on;

arch/arm/boot/dts/nxp/imx/imx6ul-ccimx6ulsom.dtsi

@@ -114,7 +114,6 @@ vrefddr: vrefddr {
 			};
 
 			vdda_adc_3v3: vldo1 {
-				compatible = "regulator-fixed";
 				regulator-name = "vref-adc-3v3";
 				regulator-min-microvolt = <3300000>;
 				regulator-max-microvolt = <3300000>;