Checkpolicy: Migrate to soong

Remove checkmodule target. It's not used anywhere.

Bug: 37512442
Test: build and boot Marlin.
Test: "dispol policy", then display unconditional avtab
Test: run "bpfmt -w Android.bp" verify no changes made.
Change-Id: Ifa29b600bd90cc16c612eb05e1e2ba9f6faed3e6
4 files changed