WIP: simtech: disable CMER/CIND support explicitly in the SIM7xxx family
The logic to setup the generic +CIND indications in the SIM7600E seems to end up breaking connectivity when in TTY+PPP mode. If we issue the AT+CMER=3,0,0,1 command, this will end up in the modem not replying a correct CONNECT response to the ATD command.
Let's disable these +CIND indications completely in these devices, via a new generic udev tag managed in the MMBroadbandModem logic.
Edited by Aleksander Morgado