dtoc: binman: Drop Python 2 code

Drop a few more Python 2 relics that are no-longer needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/dtoc/fdt.py b/tools/dtoc/fdt.py
index 4a78c73..965106a 100644
--- a/tools/dtoc/fdt.py
+++ b/tools/dtoc/fdt.py
@@ -460,8 +460,7 @@
             prop_name: Name of property to add
             val: String value of property
         """
-        if sys.version_info[0] >= 3:  # pragma: no cover
-            val = bytes(val, 'utf-8')
+        val = bytes(val, 'utf-8')
         self.AddData(prop_name, val + b'\0')
 
     def AddSubnode(self, name):