Ensure that service_manager adds / finds make sense.

Add a neverallow rule asserting that services registered or queried
through servicemanager must have the attribute service_manager_type
or vndservice_manager_type. Attempting to add or query a service which
does not have one of those attributes is malformed policy.

See
https://android-review.googlesource.com/c/platform/system/sepolicy/+/826500/7/private/system_server.te#696
as an example where this occurred.

Test: compiles
Change-Id: I339bde04b80819b07832d96797fd7f477a4b676a
1 file changed