Build vendor/odm sepolicies with Android.bp

The following files are built with Android.bp:
- vendor_sepolicy.cil
- odm_sepolicy.cil
- prebuilt_sepolicy

Also, prebuilt_policy.mk is removed as it's now redundant.

Bug: 33691272
Test: build and compare artifacts
Test: build with rvc-dev sepolicy
Change-Id: I7bf79c9c85c63cd942b36f7cf5ddda1860626c0b
6 files changed