raspberrypi0-wifi.conf: Use a stand alone machine configuration
raspberrypi0-wifi.conf: Use a stand alone machine configuration

As well make all the variables assigned in a way that they can be
overwritten so we can give maximum flexibility to distros.

Signed-off-by: Andrei Gherzan <8dc7c09356db0b1762fb140617d7375c0a5a4131@gherzan.ro>

LocutusOfBorg/meta-raspberrypi,LocutusOfBorg/meta-raspberrypi,kraj/meta-raspberrypi,kraj/meta-raspberrypi,leon-anavi/meta-raspberrypi,kraj/meta-raspberrypi,agherzan/meta-raspberrypi,schnitzeltony/meta-raspberrypi,d21d3q/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,schnitzeltony/meta-raspberrypi,agherzan/meta-raspberrypi,leon-anavi/meta-raspberrypi,d21d3q/meta-raspberrypi,LocutusOfBorg/meta-raspberrypi,leon-anavi/meta-raspberrypi,d21d3q/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,LocutusOfBorg/meta-raspberrypi,d21d3q/meta-raspberrypi,schnitzeltony/meta-raspberrypi