device-lenovo-21bx: depend on alsa-ucm-conf (MR 5714)

fixes #3251

[ci:skip-build]: already built successfully in CI

device/community/device-lenovo-21bx/APKBUILD

@@ -5,12 +5,13 @@
 pkgname=device-lenovo-21bx
 pkgdesc="Lenovo ThinkPad X13s"
 pkgver=10
-pkgrel=1
+pkgrel=2
 url="https://postmarketos.org"
 license="MIT"
 arch="aarch64"
 options="!check !archcheck !strip"
 depends="
+	alsa-ucm-conf
 	bootmac
 	firmware-lenovo-21bx
 	libmbim-tools