Our 7.1.2 kernel was dying a couple of seconds after mounting root on every
8 Gen 2 device, so nothing ever got logged. Swapped it for a 7.0.14 kernel
that already boots these handhelds. Our system ran fine on it on an Odin 2
Mini, the screen only stayed off because the kernel's modules weren't on the
card, so those are included now (scripts/import-sm8550-kernel.sh).

The debug file on BOOT also works with any kernel now and writes logs right
away, and the bluetooth service had a broken line.