Revert "Revert "vib example client on product""

This reverts commit 29254e1e.

It includes a fix for product apps for the targets without
PRODUCT_ENFORCE_PRODUCT_PARTITION_INTERFACE=true.

Reason for revert: reland from partner questions with a fix
Bug: b/271988499 # asked again
Test: TARGET_PRODUCT=ndk build/soong/soong_ui.bash --make-mode --soong-only out/soong/ndk.timestamp

Change-Id: I066eb75274c291cf832ad9847c0a4623af797f41