Linux 5.18 brought better support for some x86-based Android tablets,
thanks to work from Hans de Goede. This includes asus-me176c: the
modified ACPI table and the Linux fork is no longer necessary,
it can just run linux-edge from Alpine.
Drop the old Linux 5.4 fork and related packages. Instead of using
the proprietary sound firmware from linux-firmware-intel, switch to
using the open-source(!) "Sound Open Firmware" (SOF).
NOTE: The mainline battery driver seems quite a bit less accurate
than the ugly old driver ported from the downstream driver. Also,
Bluetooth seems to fail on some boots now. Overall it works quite
well though. :)
