Use genfs labels version library

Instead of hard-coding the text path everywhere, this uses a library to
get the genfs labels version.

As genfs labels affect SELinux, this also adds logs to help debug
issues.

Bug: 378805380
Test: boot and check log
Change-Id: I843c97cbeb0c211c67e0172458a4f0d236cf1f06
2 files changed