beluga: Performance improvements, wlan, audio and Bluetooth fixes.

[MagneFire]

This adds support for WiFi and audio on beluga.

The WiFi and audio kernel modules are not available by default in the kernel source, they are provided in other repositories. This means that they need to be compiled out-of-tree. The WiFi kernel module is loaded by a systemd service as it doesn't appear to work early in the boot process. The audio kernel modules are loaded via the android-init scripts, this is also the place where we boot the aDSP. After which the pulseaudio droid module will work.

It needed some changes to make-mod-scripts. For now I've made these changes only for beluga but we might want to move this to the meta-asteroid layer instead.

This PR also fixes the issue where the Bluetooth mac address would be reset to some random mac address when the watch is rebooted. This is achieved by starting the btnvtool binary.

This imports some performance improvements from a previous catfish PR: https://github.com/AsteroidOS/meta-smartwatch/pull/109

This fixes: https://github.com/AsteroidOS/meta-smartwatch/issues/131

[FlorentRevest]

Excellent, I should really get a beluga! It's the first time I see this kind of out of tree modules but that's cool :) the more out of tree modules vendor kernels will have the easier it will be to update the base kernel