GTA02: fix for clicking noise and JACK_INSERT interrupts

[Andy Green]

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Somebody in the thread at some point said:

> Driving nDL_GSM low caused the GSM modem to inject communication requests

We need to discuss with hardware / GSM people tomorrow to eradicate this
crazy circuit on A6 by piping GSM data via USB or WLAN or anything else
than this.

- -Andy
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