Give bootanimation access to /dev/snd files so it can use tinyalsa

Bug: 17674304

Change-Id: Ide32833809bca8d3ed8ddc898748e25d7a692319

bootanim.te

@@ -12,3 +12,6 @@ allow bootanim gpu_device:chr_file rw_file_perms;
 # /oem access
 allow bootanim oemfs:dir search;
 allow bootanim oemfs:file r_file_perms;
+
+allow bootanim audio_device:dir r_dir_perms;
+allow bootanim audio_device:chr_file rw_file_perms;