CDD: add per-app selinux requirements for P

Apps that target Android P can no longer share data with other apps
using world-accessible Unix permissions. This change improves the
integrity of the Android Application Sandbox, particularly the
requirement that an app's private data is accessible only by that
app. [1]

To share files with another another app, use a content provider
or shared space in external storage.

This feature enforces an existing requirement that files saved in
internal storage are accessible by the owning app. [2]

[1] https://developer.android.com/guide/topics/data/data-storage.html#filesInternal
[2] https://developer.android.com/training/data-storage/files.html#PublicFiles

Bug: 73728376
Test: n/a
Change-Id: Ib2a93fde25f660782f315d5e02978637680f7594
1 file changed