network: Don't manage usb0

The interface is left to NetworkManager
3 jobs for master in 4 minutes and 25 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed build:deb #243730
librem5

00:02:02

 
  Test
passed test:download:deb #243731
librem5

00:01:52

passed test:download:pip #243732
librem5

00:02:22