samsung-a6lte: configure headroom in wireplumber (MR 5021)

It seems that wireplumber is now installed by default, instead of pipewire-media-session. Thus we need to set api.alsa.headroom in wireplumber configuration too to get working audio.

This basically copies /usr/share/wireplumber/wireplumber.conf.d/alsa-vm.conf and relaxes the filters.
[ci:skip-build]: already built successfully in CI

device/testing/device-samsung-a6lte/APKBUILD

@@ -2,7 +2,7 @@
 pkgname=device-samsung-a6lte
 pkgdesc="Samsung Galaxy A6 2018"
 pkgver=0.5
-pkgrel=7
+pkgrel=8
 url="https://postmarketos.org"
 license="MIT"
 arch="aarch64"
@@ -35,6 +35,7 @@ source="
 	usr-share-alsa-ucm2-conf.d-Universal7870-I-Universal7870-I.conf
 	usr-share-alsa-ucm2-conf.d-Universal7870-I-VoiceCall.conf
 	usr-share-pipewire-media-session.d-alsa-monitor.conf
+	usr-share-wireplumber-wireplumber.conf.d-headroom.conf
 "
 subpackages="
 	$pkgname-kernel-downstream:kernel_downstream
@@ -61,6 +62,7 @@ package() {
 	install -Dm644 usr-share-alsa-ucm2-conf.d-Universal7870-I-Universal7870-I.conf "$pkgdir"/usr/share/alsa/ucm2/conf.d/Universal7870-I/Universal7870-I.conf
 	install -Dm644 usr-share-alsa-ucm2-conf.d-Universal7870-I-VoiceCall.conf "$pkgdir"/usr/share/alsa/ucm2/conf.d/Universal7870-I/VoiceCall.conf
 	install -Dm644 usr-share-pipewire-media-session.d-alsa-monitor.conf "$pkgdir"/usr/share/pipewire/media-session.d/alsa-monitor.conf
+	install -Dm644 usr-share-wireplumber-wireplumber.conf.d-headroom.conf "$pkgdir"/usr/share/wireplumber/wireplumber.conf.d/headroom.conf
 }
 
 kernel_downstream() {
@@ -111,4 +113,5 @@ abe1c4a2f59fe862cebef75c54b8806bd86ce06aeb15d8c0699ab1338c9d575cb72a4d5b099f9427
 dc528deb556906adfb89b02b6faa04a8b21358706bb60e2fa51c8a3c909b680fcc02fa425b0cb5d6273595f27dfc9b640e1a8d455657fd6b47652af9e8ec295a  usr-share-alsa-ucm2-conf.d-Universal7870-I-Universal7870-I.conf
 3e74de3504f134a2726ee87740c5803bbd578352674d1d7de8b9460e57553100e9c4d322143ee83d3d584884c52eef47762bed41814ff1fca8cd9c4552f39b73  usr-share-alsa-ucm2-conf.d-Universal7870-I-VoiceCall.conf
 5e87452f4cd70bbbcfb3e69bae73f2690ba328e7ccde55c47482e8fb1583d807de5bd3d328b1fe6a8733b4de78b2ed0c6ae8cdb60f6bf51ed4362c2174671b3e  usr-share-pipewire-media-session.d-alsa-monitor.conf
+be561f0573c73bdcf37fbd8e4659e92577a0818aafb75d73e7cbf1dd8980f29313170703074ee0cc9cc5b5a07cd7ac8ced07dfdc77b0b31a0cd34d66ae0473a4  usr-share-wireplumber-wireplumber.conf.d-headroom.conf
 "

device/testing/device-samsung-a6lte/usr-share-wireplumber-wireplumber.conf.d-headroom.conf

+monitor.alsa.rules = [
+  # Generic PCI cards on any VM type
+  {
+    matches = [
+      {
+        node.name = "~alsa_input.*"
+      }
+      {
+        node.name = "~alsa_output.*"
+      }
+    ]
+    actions = {
+      update-props = {
+        api.alsa.period-size   = 1024
+        api.alsa.headroom      = 2048
+      }
+    }
+  }
+]