No PPP / limit plugins first draft patch

[Peter Naulls]

This removes PPP entirely from consideration in ModemManager. This has 2 patches 
- one for the OpenWrt build (against the 21.02 release(ish)) and MM itself 
(against 1.18.4).

This is definitely incomplete. In particular, the MM scripts still reference 
pppd.  And ppp (pppoe in particular) is somewhat sewn into luci.  My goal
here would be to completely remove ppp(d) from the OpenWrt build if possible.

Also, I think some of the plugins rely on PPP, turning it off for some will
definitely break.  However, this suffices for my immediate needs. Obviously
the plugin selection needs to be expanded in Config.in.

Regards.

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