arm: dts: rockchip: rk3188-radxarock-u-boot: remove timer compatible replacement

The Rockchip timer driver has been renamed after the fall back compatible.
There's no need to replace the timer compatible in rk3188-radxarock-u-boot.dtsi
anymore, so remove.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3188-radxarock-u-boot.dtsi b/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
index 9c9016d..de29959 100644
--- a/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
+++ b/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
@@ -52,7 +52,6 @@
 };
 
 &timer3 {
-	compatible = "rockchip,rk3368-timer", "rockchip,rk3288-timer";
 	clock-frequency = <24000000>;
 	u-boot,dm-spl;
 };