Run host_init_verifier when building filesystem

As part of building Android images we run host_init_verifier to ensure
that .rc files are well-formed. Unfortunately that doesn't cover the
Microdroid image. This change addresses the divergence.

Ideally we should have a concept of pluggable linters that we can run on
the generated image. However, introducing such concept will take some
time, so while we are working on it directly integrate
host_init_verifier into the build system.

Bug: 263486078
Test: m microdroid
Test: add incorrect .rc file and run m microdroid, verify it fails
Change-Id: Id8c9311915e89a10ce3ff7b1f209ebc8cb42211f