Changes
- Bump firmware to RPi bluez-firmware 1.2-4+rpt6 release (#918) @agners
- RaspberryPI: Fix issue with correct SYMLINK with ttyAMA (#915) @pvizeli
- Bump version to 4.15 @agners
- Linux: Update kernel 5.4.72 (#907) @agners
- Fix CDC ACM error recovery path (#712) (#905) @agners
- Fix systemd time-wait-sync inotify bugs (#897) @tmm1
- Fix var-lib-NetworkManager.mount dependencies (#895) @tmm1