squisher: optimize /system/priv-app/ too

Change-Id: I8e7726af97124ba6ba06bf756d5c82be3a6d6c73
Signed-off-by: Roman Birg <romanbirg@gmail.com>
Update selinuxrelabel

Change-Id: I9040a4906f84db886b681231a3203c9f7529b906
Signed-off-by: iceandfire <arhamjamal@gmail.com>