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/binman/fmap_util.py b/tools/binman/fmap_util.py
index b03fc28..8277619 100644
--- a/tools/binman/fmap_util.py
+++ b/tools/binman/fmap_util.py
@@ -53,8 +53,8 @@
 
 
 def NameToFmap(name):
-    if type(name) == bytes and sys.version_info[0] >= 3:
-        name = name.decode('utf-8')  # pragma: no cover (for Python 2)
+    if type(name) == bytes:
+        name = name.decode('utf-8')
     return name.replace('\0', '').replace('-', '_').upper()
 
 def ConvertName(field_names, fields):