Add PlatformCompat feature for DocumentUI

- Whitelist PlatformCompat permissions for DocumentsUI
- Add documents-ui-compat-config into Android.bp

Bug: 141600225
Test: build and boot to home
Test: tools/tradefederation/core/tests/run_tradefed_tests.sh \
      --class com.google.android.asit.DeviceBootTestTest
Change-Id: Iedf73faf497a4ea055b33f68dc0b7097f306791d