binman: Rename tools parameter to btools

This shadows the patman.tools library so rename it to avoid a pylint
warning.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
diff --git a/tools/binman/entry.py b/tools/binman/entry.py
index da77236..786c959 100644
--- a/tools/binman/entry.py
+++ b/tools/binman/entry.py
@@ -1101,11 +1101,11 @@
         """
         pass
 
-    def AddBintools(self, tools):
+    def AddBintools(self, btools):
         """Add the bintools used by this entry type
 
         Args:
-            tools (dict of Bintool):
+            btools (dict of Bintool):
         """
         pass