sefcontext_compile: migrate to soong

Bug: 37512442
Test: build and boot Marlin.
Test: "bpfmt -w Android.bp"
Change-Id: Ib5a0aa8eb29457e3191bad12229a0a4171daa6b6
Merged-in: I25cd36c1233712fdffcef4aef9b53155fb724dbe
3 files changed