Revert "l2cap: handle le connection response error"

This reverts commit a0b70078.

Reason for revert: ACL disconnect if the remote doesn't have enough resource for all the channels.

Bug: 236216322
Bug: 261441909

Test: PTS L2CAP/TIM/BV-03-C PASS
Test: ACL keep alive even if remote doesn't have enough resource for all the channels

Change-Id: I43a3b5c06dcfc4cc08b5ef1959cc62037a53006b