ARM: dts: BCM53573: Add architected timer

It's a standard ARM architected timer that was simply missed when
initially adding this .dtsi file.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm53573.dtsi

@@ -48,6 +48,14 @@ gic: interrupt-controller@1000 {
 		};
 	};
 
+	timer {
+		compatible = "arm,armv7-timer";
+		interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_LOW>,
+			     <GIC_PPI 14 IRQ_TYPE_LEVEL_LOW>,
+			     <GIC_PPI 11 IRQ_TYPE_LEVEL_LOW>,
+			     <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>;
+	};
+
 	clocks {
 		#address-cells = <1>;
 		#size-cells = <1>;