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-qspi.dts b/arch/arm/dts/zynqmp-mini-qspi.dts
index ee8be53..e35317f 100644
--- a/arch/arm/dts/zynqmp-mini-qspi.dts
+++ b/arch/arm/dts/zynqmp-mini-qspi.dts
@@ -53,7 +53,7 @@
 			#size-cells = <0>;
 		};
 
-		misc_clk: misc_clk {
+		misc_clk: misc-clk {
 			compatible = "fixed-clock";
 			#clock-cells = <0>;
 			clock-frequency = <125000000>;