dts: gen_defines: Change f-string to normal string

Change the use of a f-string to a normal string as there is nothing
that needs formatting in the particular instance.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>

scripts/dts/gen_defines.py

diff --git a/scripts/dts/gen_defines.py b/scripts/dts/gen_defines.py
index 5185acb..2d8bb56 100755
--- a/scripts/dts/gen_defines.py
+++ b/scripts/dts/gen_defines.py
@@ -95,7 +95,7 @@
         for node in sorted(edt.nodes, key=lambda node: node.dep_ordinal):
             write_node_comment(node)
 
-            out_comment(f"Node's full path:")
+            out_comment("Node's full path:")
             out_dt_define(f"{node.z_path_id}_PATH", f'"{escape(node.path)}"')
 
             if node.parent is not None: