ARM: dts: Specify clocks for timer on bcm11351

Specify the external clock label in the timer node.
Signed-off-by: Tim Kryger <tim.kryger@linaro.org>
Reviewed-by: Markus Mayer <markus.mayer@linaro.org>
Reviewed-by: Matt Porter <matt.porter@linaro.org>
Signed-off-by: Christian Daudt <bcm@fixthebug.org>

arch/arm/boot/dts/bcm11351.dtsi

@@ -95,7 +95,7 @@ timer@35006000 {
 		compatible = "brcm,kona-timer";
 		reg = <0x35006000 0x1000>;
 		interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
-		clock-frequency = <32768>;
+		clocks = <&hub_timer_clk>;
 	};
 
 	gpio: gpio@35003000 {