Relabeling /proc/asound so everything has proc_asound label

This is to simplify access for hal_audio

Test: ls -Z in /proc/asound correctly shows everything with proc_asound
selinux label

Change-Id: I66ed8babf2363bee27a748147eb358d57a4594c4

private/genfs_contexts

@@ -2,8 +2,7 @@
 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:s0
-genfscon proc /asound/devices u:object_r:proc_asound:s0
+genfscon proc /asound 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