package/pipewire: alsa needs ucm

alsa unconditionally uses ucm since version 0.3.7 and
https://gitlab.freedesktop.org/pipewire/pipewire/-/commit/1612f5e4d215bd5edf7d649d220b53ff1ed7c098
which will result in the following build failure since commit
a6d88d3b:

../spa/plugins/alsa/acp/alsa-ucm.h:26:10: fatal error: alsa/use-case.h: No such file or directory
   26 | #include <alsa/use-case.h>
      |          ^~~~~~~~~~~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/ef53534daf84397b4e22392f2a6be2c335819ab5



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>