arm64: zynqmp: Replace '-' by '_' in fixed clock nodes

Using '_' in node name is not recommended that's why convert them to use
'-' instead.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/3979167636f0a5970a9ab642a4e0ea6a46b3f8d7.1704705872.git.michal.simek@amd.com
diff --git a/arch/arm/dts/zynqmp-mini-emmc0.dts b/arch/arm/dts/zynqmp-mini-emmc0.dts
index 02e80bd..7823c58 100644
--- a/arch/arm/dts/zynqmp-mini-emmc0.dts
+++ b/arch/arm/dts/zynqmp-mini-emmc0.dts
@@ -35,7 +35,7 @@
 		bootph-all;
 	};
 
-	clk_xin: clk_xin {
+	clk_xin: clk-xin {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
 		clock-frequency = <200000000>;