dts: rk3368: make timer0 accessible for SPL and TPL

To use it with the DM timer driver in SPL and TPL, timer0 needs to be
marked as pre-reloc.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/dts/rk3368-lion-u-boot.dtsi

@@ -85,4 +85,9 @@
 	};
 };
 
+&timer0 {
+	u-boot,dm-pre-reloc;
+	clock-frequency = <24000000>;
+};
+
 

arch/arm/dts/rk3368.dtsi

@@ -687,7 +687,7 @@
 		status = "disabled";
 	};
 
-	timer@ff810000 {
+	timer0: timer@ff810000 {
 		compatible = "rockchip,rk3368-timer", "rockchip,rk3288-timer";
 		reg = <0x0 0xff810000 0x0 0x20>;
 		interrupts = <GIC_SPI 66 IRQ_TYPE_LEVEL_HIGH>;