Bluetooth: controller: llcp: set refactored LLCP as default

[kruithofa]

This PR sets the refactored LLCP as default

This exposed some missing include files and struct definitions, which are also added in this PR

Also an update to the babblesim tests is required

Issue #48823 has been created because of the reduction in nr. of connections for the tests/bluetooth/bsim_bt/bsim_test_multiple test

Issue #44339 has been created for the missing support of advanced scheduling

Fixes #46065

[kruithofa]

https://github.com/zephyrproject-rtos/zephyr/pull/46462/files#r941999012 . You can assign me to the PR you create for that test.

See PR #48859