Add some stuff for wifi

Still not working, though.  I'm actually not sure the wifi module is
even loading our firmware... system/core/init/devices.c is supposed
to be printing some stuff about firmware loading, but I don't see
anything in dmesg.
cm.mk: Remove false build fingerprint

We're not a Nexus, and U8185 only ever got Gingerbread offically,
so there's no point lying.  Let's just use CM's fingerprint.