If an audio file is placed on the sdcard, an application
will require an explicit selinux permission to access it.
This commit adds selinux rule that allows audio_console_app
to read and write a file on the sdcard's topmost directory.

This enables playing from and saving recordings on sdcard.

Change-Id: I1441cb76d2add6c63c87fdfb0410d4813e90c280