priv_app.te: drop auditallows on cache_recovery_file

This is actually used. Addresses the following SELinux audit logs:

  avc: granted { create } for comm="Thread-157" name="uncrypt_file" scontext=u:r:priv_app:s0:c512,c768 tcontext=u:object_r:cache_recovery_file:s0:c512,c768 tclass=file
  avc: granted { add_name } for comm="Thread-157" name="uncrypt_file" scontext=u:r:priv_app:s0:c512,c768 tcontext=u:object_r:cache_recovery_file:s0 tclass=dir
  avc: granted { write } for comm="Thread-157" path="/cache/recovery/uncrypt_file" dev="mmcblk0p38" ino=22 scontext=u:r:priv_app:s0:c512,c768 tcontext=u:object_r:cache_recovery_file:s0:c512,c768 tclass=file
  avc: granted { write } for comm="Thread-157" path="/cache/recovery/command" dev="mmcblk0p38" ino=23 scontext=u:r:priv_app:s0:c512,c768 tcontext=u:object_r:cache_recovery_file:s0:c512,c768 tclass=file
  avc: granted { setattr } for comm="Thread-157" name="uncrypt_file" dev="mmcblk0p38" ino=22 scontext=u:r:priv_app:s0:c512,c768 tcontext=u:object_r:cache_recovery_file:s0:c512,c768 tclass=file

Change-Id: Idab00ebc8eacd7d8bb793b9342249227f91986a1