iop: setup_host: Make /usr/bin/python Python 2
Make /usr/bin/python point to Python 2 as it has been before aacc789c ("iop: setup_host: Add python3-distutils"). This fixes Broadcom WiFi driver compilation. For now, fix it by adding the package back. Installing python installs python-is-python2, but by installing python-is-python2 we avoid repeated prompts because python is not installed (virtual package).
In the future, we may investigate compiling Broadcom SDK with Python 3 only or with the Python 2 shipped with the toolchain they provide.
Fixes: aacc789c ("iop: setup_host: Add python3-distutils")