Bluetooth: L2CAP: Handle information response command on BR/EDR

Adds support getting L2CAP information about remote features. To get
the response local stack gets call information request about 'extended
features supported mask' after ACL link is established. Then in
response if 'fixed channels' bits are enabled, next information
request is sent to get details about 'fixed channels'.

Change-Id: I4980c61b12e83fef914e97dea296b0a848d59034
Signed-off-by: Arkadiusz Lichwa <arkadiusz.lichwa@tieto.com>