L2cap: Send connection req after received info resp

We need to wait for information response extended features supported to
check ERTM support before we send connection request. If ERTM isn't
supported, we drop the connection request and notify client.

Test: cert/run --host
Test: L2CAP/CMC/BV-02-C
Change-Id: I2c1ef869af04a1cfede995fd3040f5b5c396b06b