ARM: dts: keystone: add keystone timer entry

Add keystone timer entry to keystone device tree.
This 64-bit timer is used as backup clock event device.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
diff --git a/arch/arm/boot/dts/keystone.dtsi b/arch/arm/boot/dts/keystone.dtsi
index 3a83ffe..d9303e8 100644
--- a/arch/arm/boot/dts/keystone.dtsi
+++ b/arch/arm/boot/dts/keystone.dtsi
@@ -214,5 +214,12 @@
 			reg = <0x022f0080 0x80>;
 			clocks = <&clkwdtimer0>;
 		};
+
+		clock_event: timer@22f0000 {
+			compatible = "ti,keystone-timer";
+			reg = <0x022f0000 0x80>;
+			interrupts = <GIC_SPI 110 IRQ_TYPE_EDGE_RISING>;
+			clocks = <&clktimer15>;
+		};
 	};
 };