l2cap: Fix setting FCS Option

As per BT Core specification, FCS option shall be preset if ERTM or
Streaming mode is used and peer supports it.

Since Android supports FCS option, lets set it here, and later, code
will check if peer supports it as well in: l2cu_process_our_cfg_req()

Bug: 371947246
Bug: 372605959
Test: manual PTS test case
Test: mmm packages/modules/Bluetooth
Flag: com::android::bluetooth::flags::l2cap_fcs_option_fix

Change-Id: I5a2333207a9b27c1253aa4e33ca06389a68655ec