sepolicy: build error if non-platform classes present

Error out if we detect that there is a security_classes or
access_vectors file outside of system/sepolicy.

Of course, this test can't enforce any requirements, as it's not part of
CTS. But it can still serve as an early signal.

Fixes: 142153384
Test: add access_vectors to device policy, observe build error
Change-Id: Ib94b7f85e184340de8ec7943c8da88a0af3427e8
1 file changed