package/pipewire-media-session: needs alsa-lib-ucm

Fix the following build failure raised since the addition of the
package in commit 51f30f47cd04efe494c8da37077bea860d3fbe14:

../src/alsa-endpoint.c:34:10: fatal error: alsa/use-case.h: No such file or directory
   34 | #include <alsa/use-case.h>
      |          ^~~~~~~~~~~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/bbf54d1bdb0f8f2d4f675ffdcbcbbf56562c3d7b

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

package/pipewire-media-session/Config.in

@@ -4,6 +4,7 @@ config BR2_PACKAGE_PIPEWIRE_MEDIA_SESSION
 	depends on BR2_USE_MMU # dbus
 	depends on BR2_PACKAGE_PIPEWIRE
 	select BR2_PACKAGE_ALSA_LIB
+	select BR2_PACKAGE_ALSA_LIB_UCM
 	select BR2_PACKAGE_DBUS
 	help
 	  Build pipewire media-session support