add wireplumber config to fix audio on SP7

Author: thattransgal

files/system/etc/wireplumber/wireplumber.conf.d/51-alsa-sw-volume.conf

@@ -0,0 +1,15 @@
+monitor.alsa.rules = [
+  {
+    matches = [
+      {
+        node.name = "alsa_output.pci-0000_00_1f.3.analog-stereo"
+      }
+    ]
+    actions = {
+      update-props = {
+        api.alsa.use-hw-volume = false
+        api.alsa.use-hw-decibel-volume = false
+      }
+    }
+  }
+]