24Q4: Removal of leaudio_call_start_scan_directly

Bug: 348562830
Fix: 348562830
Flag: com.android.bluetooth.flags.leaudio_call_start_scan_directly
Test: m . | Tested by soaking and QA and flag release
Change-Id: Ifcadb97d381bc401f50a2e243e8bb0ac5f14782a