Sync with bluez alsa 220708 (#1)

After kernel upgrade long term play introduces XRUNs.

Tried to sync the code with a recent version of bluez alsa (from 220708).
alsa-cdsp is original based on bluez-alsa `source/asound/bluealsa-pcm.c`.
Sync the changes made to bluez-alsa, where applicable, to alsa-cdsp.
Some of the changes concerns fixing the snd_pcm_avail bug and XRUNs.

While it did fix the XRUNs, it also introduced artifacts on pause/play.
Reverted for to old delay variant for the first 100k samples and then switch to the new delay calculation.