Resolve "Clean up leftover 16 bit HRTF ROM switches"

• Related issues: #1163 (closed)
• Requested reviewers: @vaclav, @pihlajakuja, @emerit, @kinuthia

Reason why this change is needed

• Removal of redundant code, preemptively reduce merge conflicts and nested switch maintenance

Description of the change

• Inactive switches stripped

Affected operating points

• N/A

Related to #1163 (closed)