adi: break down adi_config_ap to decrease nesting

[HrMitrev]

Detailed description

This is just a refactoring commit to the reading of adi_configure_ap easier by decreasing nesting. The behavior should be the same

Your checklist for this pull request

• I've read the Code of Conduct
• I've read the guidelines for contributing to this repository
• It builds for hardware native (see Building the firmware)
• It builds as BMDA (see Building the BMDA)
• I've tested it to the best of my ability
• My commit messages provide a useful short description of what the commits do

[dragonmux]

LGTM, please rebase this on main (not git merge, but rather a full git rebase) and then we'll merge it. Thank you for the contribution!