filter: let the user tag modems explicitly

The user can tag modems (either full devices or ports independently)
to be explicitly probed by ModemManager, using the new
"ID_MM_DEVICE_PROCESS" udev tag, e.g.:

    $ sudo vim /lib/udev/rules.d/78-mm-whitelist-internal-modem.rules
        ACTION!="add|change|move", GOTO="mm_whitelist_internal_modem_end"
        ATTRS{idVendor}=="1199", ATTRS{idProduct}=="a001", ENV{ID_MM_DEVICE_PROCESS}="1"
        LABEL="mm_whitelist_internal_modem_end"
    $ sudo udevadm control --reload
    $ sudo udevadm trigger

This rule runs before any other filter rule.

This tag may be used e.g. by manufacturers building systems with
built-in modems that will always be available.

Distributions targeting support for multiple modem devices shouldn't
use this udev tag.

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