fix for stuttering Bluetooth Audio on Asahi Linux Fedora 42 on Macbook Air M2 (BCM4377/BCM4378/BCM438)

Fix based on infos from this issue.

Install:

sudo ./install.sh

(If you dont want to fix Bluetooth latency, which is a separate thing, comment out the last part in the script).

If you want to test first, you can also use this bash alias to fix stuttering bluetooth audio temporarily (does not include the latency fix):

alias fixbt='handle=$(hcitool con | grep -oP "handle \K[0-9]+"); sudo hcitool cmd 0x3f 0x57 $(printf 0x%02X $handle) 0x00 0x01'