L2cap Signalling manager: Handle lost info request

If the remote doesn't respond info request extended features, or sends
CommandReject, we assume the remote doesn't support ERTM or FCS.
(We should probably note which remote device in the future, as
respondong to info request is mandatory, and supporting ERTM is
mandatory for BT 4.0+)

Test: cert/run --host
Change-Id: Ia7ba11d1c1d3b9245be6f7db09847aba0d0f7b22