floss: Add sysprop for RTL advertisement monitor quirk

This prop will be used by https://r.android.com/3016133

Bug: 294961421
Tag: #floss
Test: mmm packages/modules/Bluetooth
Test: manual Log the prop somewhere, adjust sysprop.conf and verify log
Flag: EXEMPT, Floss-only changes
Change-Id: I587728f4076a053bdd7479b6500b196840d8f793