ARM: dts: k3-am642: Correct timer frequency

Timer0 runs at 200MHz,and the clock-frequency defined in DT is
incorrect. Fix it.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-By: Nishanth Menon <nm@ti.com>
diff --git a/arch/arm/dts/k3-am642-evm-u-boot.dtsi b/arch/arm/dts/k3-am642-evm-u-boot.dtsi
index 03688a5..0c2d973 100644
--- a/arch/arm/dts/k3-am642-evm-u-boot.dtsi
+++ b/arch/arm/dts/k3-am642-evm-u-boot.dtsi
@@ -16,7 +16,7 @@
 		compatible = "ti,omap5430-timer";
 		reg = <0x0 0x2400000 0x0 0x80>;
 		ti,timer-alwon;
-		clock-frequency = <250000000>;
+		clock-frequency = <200000000>;
 		u-boot,dm-spl;
 	};
 };