Bluetooth: Classic: HFP_AG: Add callback `redial` to get number

If a phone was made during the previous SLC, AG cannot properly
process the redial request sent by HF after reconnecting.

Add a callback `redial` to get the last dial number from the upper
layer when `AT+BLDN` command is received.

If the callback is not provided or the error is returned after the
callback returned, send error response to the HF.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>
3 files changed