nimble/l2cap: Add PTS instructions for LE CoC and run all the testcases
nimble/l2cap: Add PTS instructions for LE CoC and run all the testcases

This patch adds instructions for LE CoC and fixes adv data settings
for previous test cases.

X-Original-Commit: b907e7d3ea98965dae6d3b8d1bf858bce48c96aa

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble