spec: Split out a fwupd-plugin-modem-manager subpackage
spec: Split out a fwupd-plugin-modem-manager subpackage

This is installed by default, but means it can be excluded from the minimal
CoreOS image. It's highly unlikely that anything running CoreOS has mobile
broadband hardware attached.

This drops inclusion of libmbim, libqmi and ModemManager-glib as hard
dependencies from the package set.

hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,fwupd/fwupd