[Raspberry] `snd-bcm2835.enable_compat_alsa` is no longer defined.

[ashthespy]

@Darmur in bf30089 the kernel version based compat_alsa logic was removed.

volumio3-os/recipes/devices/pi.sh

Lines 354 to 355 in bf30089

	# ALSA tweaks
	kernel_params+=("snd-bcm2835.enable_compat_alsa=${compat_alsa}" "snd_bcm2835.enable_hdmi=1" "snd_bcm2835.enable_headphones=1")

So now an empty snd-bcm2835.enable_compat_alsa= is added to the kernel parameters (as $compat_alsa is undefined)

If this flag no longer does anything, should it also be removed to avoid confusion?

[Darmur]

yes, we should get rid of it

[foonerd]

Which init version is the target here?

[foonerd]

Tested with params and without. Alsa audio devices do not change. Please add to Bookworm.