image/kernel-module-split/eglibc-ld.inc: Remove has_key() usage

The has_key() attribute has been removed in python 3 since there is better
syntax available. Use the improved syntax.

(From OE-Core rev: 3dff13793e875ff58cc38c4a960caca9b6969843)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/image.bbclass

@@ -368,7 +368,7 @@ for dir in dirs.split():
       key=str(os.path.join("/",os.path.relpath(item,dir)))
 
       valid=True;
-      if files.has_key(key):
+      if key in files:
         #check whether the file is allow to replace
         if allow_rep.match(key):
           valid=True