classes/lib: Update to match python3 iter requirements

python3 standardises its use of iteration operations. Update
the code to match the for python3 requires.

(From OE-Core rev: 2476bdcbef591e951d11d57d53f1315848758571)

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

meta/lib/oe/data.py

@@ -7,7 +7,7 @@ def typed_value(key, d):
     flags = d.getVarFlags(key)
     if flags is not None:
         flags = dict((flag, d.expand(value))
-                     for flag, value in flags.iteritems())
+                     for flag, value in list(flags.items()))
     else:
         flags = {}