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/genfs_contexts b/private/genfs_contexts
index b5827c8..6a95ffb 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -2,7 +2,8 @@
 genfscon rootfs / u:object_r:rootfs:s0
 # proc labeling can be further refined (longest matching prefix).
 genfscon proc / u:object_r:proc:s0
-genfscon proc /asound/cards u:object_r:proc_asound_cards:s0
+genfscon proc /asound/cards u:object_r:proc_asound:s0
+genfscon proc /asound/devices u:object_r:proc_asound:s0
 genfscon proc /cmdline u:object_r:proc_cmdline:s0
 genfscon proc /config.gz u:object_r:config_gz:s0
 genfscon proc /filesystems u:object_r:proc_filesystems:s0