[PATCH] Add voicecall driver for Handsfree profile

[Zhang, Zhenhua]

Hi,

The first patch is to handle right bracket in at command parser. It's
identical with the previous patch I sent in the list.

The second patch depends on the first one so I resend it again. It implements
voicecall driver for handsfree profile and use AT+CIEV indicator to notify call
status change. A field 'struct ofono_call *call' that point to the current call
is used to avoid searching call list each time. A boolean 'mpty_call' is to
indicate whether it is multi call or single call. The first version only
supports single call. The multicall patch will be based on this patch.

Please review it.

Regards,
Zhenhua
 
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