device-lenovo-21bx: workaround pipewire audio playback issues (MR 5065)

Override the buffer size seems to help somewhat with audio playback
under pipewire.

device/testing/device-lenovo-21bx/APKBUILD

@@ -3,7 +3,7 @@
 # Reference: <https://postmarketos.org/devicepkg>
 pkgname=device-lenovo-21bx
 pkgdesc="Lenovo ThinkPad X13s"
-pkgver=7
+pkgver=8
 pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
@@ -26,12 +26,14 @@ depends="
 makedepends="devicepkg-dev"
 source="
 	deviceinfo
-	modules-initfs
 	firmware.files
+	modules-initfs
+	pipewire.conf
 	usbguard.conf
 "
 subpackages="
 	$pkgname-usbguard
+	$pkgname-pipewire
 	$pkgname-vulkan
 "
 install="$pkgname.post-install"
@@ -60,9 +62,16 @@ usbguard() {
 	devicepkg_package $startdir $pkgname
 }
 
+pipewire() {
+	install_if="$pkgname=$pkgver-r$pkgrel pipewire"
+	install -Dm644 "$srcdir"/pipewire.conf \
+		"$subpkgdir"/usr/share/pipewire/pipewire.conf.d/"$pkgname".conf
+}
+
 sha512sums="
 c3570f44cd0134fd7400a5467cfddb3c1877a771fda8006228d1b0fd81536171ece53bf7562fc0e11dcc1fd3c6830e324e0d5ad9fdc4e16b53107fa3a04004fb  deviceinfo
-5e91aebdd5aa84eef2660c5cbecd27b1c3662f1707538d53764a74dc1e6cbac451b1041b9aaab92f087d44630036b10e5155a993dd4b2e54cba81637ddb47593  modules-initfs
 82f7719285434d8c7a5268ddc21d513bb3f3788eb3dd2df099e1c245add9d19719047b003a47edb077e095ebe09d9601b1312c001578e7dfa4ed61d72098ef74  firmware.files
+5e91aebdd5aa84eef2660c5cbecd27b1c3662f1707538d53764a74dc1e6cbac451b1041b9aaab92f087d44630036b10e5155a993dd4b2e54cba81637ddb47593  modules-initfs
+52bbb9564ec713db5d46937701b121afe0c6c644fffe189a05766f491b4997b1bbc4c1f90229efb5764d795df8d40a57d4c840ee4b32d426e7a84520364b8bf5  pipewire.conf
 0d0412eb1f01af39000c39391f622640461305d83dae1a53aa7eef640cc17fd265cabca4e4e57dea053c47a4e50f9feb90f12ee5310d5b6425783e83efc5f9d8  usbguard.conf
 "

device/testing/device-lenovo-21bx/pipewire.conf

@@ -0,0 +1,4 @@
+context.properties = {
+  default.clock.quantum = 1024
+  default.clock.min-quantum = 1024
+}