[RESTRICT AUTOMERGE] Revert "Removed IWLAN legacy mode support"

Revert submission 2370228-legacy_iwlan_removal

Reason for revert: try finding the culprit for b/275330844

Reverted changes: /q/submissionid:2370228-legacy_iwlan_removal

Change-Id: Ibd5482d73e50cdaab583a05542b9b3d471424a15
1 file changed