ARM: keystone: dts: add paclk divider clock node

PA subsystem has a fixed factor clock at the input which is
input clock divided by 3. This patch adds this clock node to dts
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

arch/arm/boot/dts/keystone-clocks.dtsi

@@ -124,6 +124,15 @@ chipclk13: chipclk13 {
 		clock-output-names = "chipclk13";
 	};
 
+	paclk13: paclk13 {
+		#clock-cells = <0>;
+		compatible = "fixed-factor-clock";
+		clocks = <&papllclk>;
+		clock-div = <3>;
+		clock-mult = <1>;
+		clock-output-names = "paclk13";
+	};
+
 	chipclk14: chipclk14 {
 		#clock-cells = <0>;
 		compatible = "fixed-factor-clock";