Bluetooth: fix connection setup in l2cap_connect

The amp_id argument of l2cap_connect() was removed in
commit 84a4bb65 ("Bluetooth: HCI: Remove HCI_AMP support")

It was always called with amp_id == 0, i.e. AMP_ID_BREDR == 0x00 (ie.
non-AMP controller).  In the above commit, the code path for amp_id != 0
was preserved, although it should have used the amp_id == 0 one.

Restore the previous behavior of the non-AMP code path, to fix problems
with L2CAP connections.

Fixes: 84a4bb65 ("Bluetooth: HCI: Remove HCI_AMP support")
Signed-off-by: Pauli Virtanen <pav@iki.fi>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>