All the python packages are inside an if BR2_PACKAGE_PYTHON3, so with the
removal of python2 support, the explicit python3 dependency is redundant.
Remove it.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Reviewed-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>