ARM: at91: add PWM device node

Add PWM device node for AT91 series SoC.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91sam9g45.dtsi

@@ -37,6 +37,7 @@
 		i2c1 = &i2c1;
 		ssc0 = &ssc0;
 		ssc1 = &ssc1;
+		pwm0 = &pwm0;
 	};
 	cpus {
 		#address-cells = <0>;
@@ -670,6 +671,14 @@
 				};
 			};
 
+			pwm0: pwm@fffb8000 {
+				compatible = "atmel,at91sam9rl-pwm";
+				reg = <0xfffb8000 0x300>;
+				interrupts = <19 IRQ_TYPE_LEVEL_HIGH 4>;
+				#pwm-cells = <3>;
+				status = "disabled";
+			};
+
 			mmc0: mmc@fff80000 {
 				compatible = "atmel,hsmci";
 				reg = <0xfff80000 0x600>;