ARM: dts: pxa: add pxa3xx pwm nodes

The pxa3xx SoC has 4 PWMs, exactly as the pxa27x does. Add them to the
description.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>

arch/arm/boot/dts/pxa3xx.dtsi

@@ -95,6 +95,38 @@ pxa3xx_ohci: usb@4c000000 {
 			clocks = <&clks CLK_USBHOST>;
 			status = "disabled";
 		};
+
+		pwm0: pwm@40b00000 {
+			compatible = "marvell,pxa270-pwm";
+			reg = <0x40b00000 0x10>;
+			#pwm-cells = <1>;
+			clocks = <&clks CLK_PWM0>;
+			status = "disabled";
+		};
+
+		pwm1: pwm@40b00010 {
+			compatible = "marvell,pxa270-pwm";
+			reg = <0x40b00010 0x10>;
+			#pwm-cells = <1>;
+			clocks = <&clks CLK_PWM1>;
+			status = "disabled";
+		};
+
+		pwm2: pwm@40c00000 {
+			compatible = "marvell,pxa270-pwm";
+			reg = <0x40c00000 0x10>;
+			#pwm-cells = <1>;
+			clocks = <&clks CLK_PWM0>;
+			status = "disabled";
+		};
+
+		pwm3: pwm@40c00010 {
+			compatible = "marvell,pxa270-pwm";
+			reg = <0x40c00010 0x10>;
+			#pwm-cells = <1>;
+			clocks = <&clks CLK_PWM1>;
+			status = "disabled";
+		};
 	};
 
 	clocks {