python-nfc: new package

[thomas.petazzoni@free-electrons.com:
   add patch that creates a standard setup.py file. This allows the
   .pyc files to be generated at build time, and installed into the
   target. This is important because by default, Buildroot removes all
   .py files from the target, to keep only the .pyc files. The
   python-nfc.mk file was changed to use this setup.py standard build
   process.]

Signed-off-by: Simon Dawson <spdawson@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>