common: sepolicy: fix DAC panel denials

[lifehackerhansol]

App needs to access permission checker service:
avc: denied { find } for pid=7932 uid=1000 name=permission_checker scontext=u:r:dac_panel_app:s0 tcontext=u:object_r:permission_checker_service:s0 tclass=service_manager permissive=0

Change-Id: I386eedaab03c0e31c9220fc1182086c98d73882e

[lifehackerhansol]

More context:

This PR fixes issues where an enforcing ROM crashes when trying to search stuff in the Settings app. I'm fairly certain you only need the permission checker to fix it, but I found some other very interesting logs where DAC couldn't find its own app settings directory, so may as well be safe and let it search through it.

[lifehackerhansol]

I removed the system_data_file search policy: it fixes nothing.

There are also several other service manager denials but since it's working I don't think it's a big issue.