mac_bsdextended: report that all tests require the kernel module

Use the standard required_kmods reporting mechanism to notify Kyua of
which kernel modules are required.

MFC after: 2 weeks
Sponsored by: ConnectWise
Reviewed by: Siva Mahadevan <me@svmhdvn.name>
Pull Request: https://github.com/freebsd/freebsd-src/pull/1783