desktops: install alsa-ucm-conf at minimal tier

Without alsa-ucm-conf installed, PipeWire / wireplumber see complex
sound cards (Intel SOF on Lunar/Meteor/Panther Lake laptops, Qualcomm
Snapdragon X, AMD ACP DSP, ...) but have no per-machine recipe for
which PCM device is the speaker output, which controls to unmute, or
how to route on jack-insert. Result: kernel-level audio is fully
alive (aplay -l shows Speaker pcm; `speaker-test -D plughw:0,2`
plays), but GNOME / KDE Sound shows only "Dummy Output" and the
speakers stay silent.

Verified on a ThinkPad X9-15 Gen 1 (LNL, CS42L43 jack + CS35L56 SPI
amps): same kernel + same SOF firmware + same Cirrus blobs + same
topology as a working Ubuntu OEM 6.17 boot of the same machine - the
only difference between "silent" and "working" was this package.

Mirrored in build's uefi_common.inc (armbian/build#9858) to cover
image builds; here in common.yaml minimal tier so the runtime
`armbian-config module_desktops install` path picks it up on any
desktop / release / arch / DE combo. Inert on simpler audio chains
(HDMI-only SBCs, USB DAC).

Author: igorpecovnik

tools/modules/desktops/yaml/common.yaml

@@ -46,6 +46,16 @@ tiers:
       # in the GTK applet for nothing.
       - network-manager
       - netplan.io
+      # ALSA Use Case Manager profiles. Without this package, PipeWire /
+      # wireplumber see a complex sound card (Intel SOF on Lunar/Meteor/
+      # Panther Lake laptops, Qualcomm Snapdragon X, AMD ACP DSP, …)
+      # but have no per-machine recipe for which PCM device is the speaker
+      # output, which controls to unmute, or how to route on jack-insert.
+      # Result: ALSA-level audio works (`speaker-test -D plughw:0,2`
+      # plays), but GNOME / KDE Sound shows "Dummy Output" only.
+      # Architecture: all package, ~1 MB on disk, inert on simpler audio
+      # chains (HDMI-only SBCs, USB DAC, etc.), so safe at minimal tier.
+      - alsa-ucm-conf
 
   mid:
     packages: