Remove ModemManager & friends (#561)

userspace/files/ModemManager.service

@@ -1,22 +0,0 @@
-[Unit]
-Description=Modem Manager
-After=polkit.service
-Requires=polkit.service
-
-[Service]
-Type=dbus
-BusName=org.freedesktop.ModemManager1
-ExecStart=/usr/sbin/ModemManager --filter-policy=strict --debug
-StandardError=null
-Restart=on-abort
-CapabilityBoundingSet=CAP_SYS_ADMIN
-ProtectSystem=true
-ProtectHome=true
-PrivateTmp=true
-RestrictAddressFamilies=AF_NETLINK AF_UNIX
-NoNewPrivileges=true
-User=root
-
-[Install]
-WantedBy=multi-user.target
-Alias=dbus-org.freedesktop.ModemManager1.service