uboot-rockchip: fix python 3.8 support

Fixes: #13749

package/boot/uboot-rockchip/patches/120-fix-binman-migrate-from.patch

@@ -0,0 +1,14 @@
+--- a/tools/binman/control.py
++++ b/tools/binman/control.py
+@@ -9,8 +9,9 @@ from collections import OrderedDict
+ import glob
+ try:
+     import importlib.resources as importlib_resources
+-except ImportError:  # pragma: no cover
+-    # for Python 3.6
++    # for Python 3.6, 3.7 and 3.8
++    importlib_resources.files
++except (ImportError, AttributeError):
+     import importlib_resources
+ import os
+ import re