Extend access to proc/asound/*

Renamed this type:
proc_asound_cards -> proc_asound

Labeled /proc/asound/devices as proc_asound.

We now use proc_asound type to label files under /proc/asound which we
want to expose to system components.

Bug: 66988327
Test: Pixel 2 boots, can play sound with or without headphones, and
selinux denials to proc_asound are not seen.

Change-Id: I453d9bfdd70eb80931ec9e80f17c8fd0629db3d0
diff --git a/private/app_neverallows.te b/private/app_neverallows.te
index db14f1b..7638d36 100644
--- a/private/app_neverallows.te
+++ b/private/app_neverallows.te
@@ -110,7 +110,7 @@
 # Create a more specific label if needed
 neverallow all_untrusted_apps {
   proc
-  proc_asound_cards
+  proc_asound
   proc_filesystems
   proc_kmsg
   proc_loadavg