ARM: dts: brcmstb: un-hexify clock frequency

This value makes much more sense in decimal.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm7445.dtsi

@@ -76,7 +76,7 @@ serial@40ab00 {
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>;
-			clock-frequency = <0x4d3f640>;
+			clock-frequency = <81000000>;
 		};
 
 		sun_top_ctrl: syscon@404000 {