ARM: dts: am43xx-epos-evm: Add regulator for VBAT and DCDC4 of tps65218

The VBAT and DCDC4 regulator is needed for audio support (tlv320aic3111)
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am43x-epos-evm.dts

@@ -31,6 +31,14 @@ vmmcsd_fixed: fixedregulator-sd {
 		enable-active-high;
 	};
 
+	vbat: fixedregulator@0 {
+		compatible = "regulator-fixed";
+		regulator-name = "vbat";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		regulator-boot-on;
+	};
+
 	lcd0: display {
 		compatible = "osddisplays,osd057T0559-34ts", "panel-dpi";
 		label = "lcd";
@@ -388,6 +396,15 @@ dcdc3: regulator-dcdc3 {
 			regulator-always-on;
 		};
 
+		dcdc4: regulator-dcdc4 {
+			compatible = "ti,tps65218-dcdc4";
+			regulator-name = "vdcdc4";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			regulator-boot-on;
+			regulator-always-on;
+		};
+
 		dcdc5: regulator-dcdc5 {
 			compatible = "ti,tps65218-dcdc5";
 			regulator-name = "v1_0bat";