arm64: dts: Add PWM DT node for NS2

Add device tree entry for PWM support for Broadcom Northstar 2 SoC.
Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm64/boot/dts/broadcom/ns2.dtsi

@@ -299,6 +299,14 @@ pmu@9000 {
 			};
 		};
 
+		pwm: pwm@66010000 {
+			compatible = "brcm,iproc-pwm";
+			reg = <0x66010000 0x28>;
+			clocks = <&osc>;
+			#pwm-cells = <3>;
+			status = "disabled";
+		};
+
 		mdio_mux_iproc: mdio-mux@6602023c {
 			compatible = "brcm,mdio-mux-iproc";
 			reg = <0x6602023c 0x14>;