arm64: zynqmp: Get 200MHz clock early for MMC

SPL MMC boot requires to have clock early.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/dts/zynqmp-clk.dtsi b/arch/arm/dts/zynqmp-clk.dtsi
index 45d84a6..a8664e8 100644
--- a/arch/arm/dts/zynqmp-clk.dtsi
+++ b/arch/arm/dts/zynqmp-clk.dtsi
@@ -25,6 +25,7 @@
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
 		clock-frequency = <200000000>;
+		u-boot,dm-pre-reloc;
 	};
 
 	clk250: clk250 {