SELinux for Android 8.0

The SELinux policy build flow for Android 4.4 through Android 7.0 merged all sepolicy fragments (platform and non-platform) then generated monolithic files in the root directory. However, this flow contradicts the primary goal of Android 8.0 architecture, which is to allow partners to update their parts of the policy, build their images ( vendor.img , boot.img , etc ), then update those images independent of the platform or vice versa (i.e., perform a platform update without updating partner images
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