Remove 'queue_l2cap_coc_while_encrypting' flag since it has been enabled in...

Remove 'queue_l2cap_coc_while_encrypting' flag since it has been enabled in prod bug-free since tm-qpr2-release.

Bug: 290845993
Tag: #stability
Test: m -j $(nproc) ; Android should build without the flag as well.
Change-Id: Icb19dfe9ca8d36bb9e95aeb477455adabc486e1c