u-boot-qoriq: add 'python3-setuptools-native' to depends

[mjeanson]

Building this recipe on an Unbuntu 20.04 host results in the following erro:

Traceback (most recent call last):
  File "u-boot-qoriq/2021.04+fslgit-r0/git/tools/binman/binman", line 39, in <module>
    from binman import control
  File "u-boot-qoriq/2021.04+fslgit-r0/git/tools/binman/../binman/control.py", line 11, in <module>
    import pkg_resources
ModuleNotFoundError: No module named 'pkg_resources'

With the added dependency the build completes.

[mjeanson]

Fixes #1496