[ASTERISK-162] chan_dahdi: Allow echo cancellation to be toggled during call

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Echo cancellation can be disabled using echocancel=no in chan_dahdi.conf.

However, the logic to do so during a call is currently a stub.

There is an AST_OPTION_ECHOCAN in frame.h, but a comment indicates this option is never used: https://github.com/mojolingo/asterisk/blob/ab490db709efbca7e4766bc7e5c368039c003e2e/include/asterisk/frame.h#L404

We would want to set the option for the call, similar to e.g. ast_channel_setoption(chan, AST_OPTION_OPRMODE, &oprmode, sizeof(oprmode), 0);

This should probably be done as part of the DAHDI part of the CHANNEL function, assuming this logic is reset on the DAHDI channel per call.

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