ARM: dts: imx6sl: add phy-3p0-supply to usb phys

The integrated usb phys are supplied by the 3p0 regulator, which has a
voltage range of 2.625V to 3.4V. Thus the min and max values are
corrected and the regulator added as a proper supply for the usb phys.

This fixes the following warnings during the probe of the mxs_phy
driver:

mxs_phy 20c9000.usbphy: supply phy-3p0 not found, using dummy regulator
mxs_phy 20ca000.usbphy: supply phy-3p0 not found, using dummy regulator

The 3p0 regulator handling was introduced by commit 966d731 ("usb:
phy: mxs: enable regulator phy-3p0 to improve signal qualilty")`.

Signed-off-by: Stefan Kerkmann <s.kerkmann@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: KarlK90

arch/arm/boot/dts/nxp/imx/imx6sl.dtsi

@@ -546,8 +546,8 @@
 				reg_vdd3p0: regulator-3p0 {
 					compatible = "fsl,anatop-regulator";
 					regulator-name = "vdd3p0";
-					regulator-min-microvolt = <2800000>;
-					regulator-max-microvolt = <3150000>;
+					regulator-min-microvolt = <2625000>;
+					regulator-max-microvolt = <3400000>;
 					regulator-always-on;
 					anatop-reg-offset = <0x120>;
 					anatop-vol-bit-shift = <8>;
@@ -640,6 +640,7 @@
 				reg = <0x020c9000 0x1000>;
 				interrupts = <0 44 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clks IMX6SL_CLK_USBPHY1>;
+				phy-3p0-supply = <&reg_vdd3p0>;
 				fsl,anatop = <&anatop>;
 			};
 
@@ -648,6 +649,7 @@
 				reg = <0x020ca000 0x1000>;
 				interrupts = <0 45 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clks IMX6SL_CLK_USBPHY2>;
+				phy-3p0-supply = <&reg_vdd3p0>;
 				fsl,anatop = <&anatop>;
 			};