huawei: ignore ^CCALLSTATE URCs for now
We will want to support these to avoid needing to have CLCC call polling, but for now, just ignore them so that they don't interfere with the call management.
For context, see: #216
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We will want to support these to avoid needing to have CLCC call polling, but for now, just ignore them so that they don't interfere with the call management.
For context, see: #216