Allow Instant/V2 apps to load code from /data/data

This restriction causes issues with dynamite.

Since untrusted_v2_app was about enforcing this constraint put installed
v2 applications back into the normal untrusted_app domain.

Bug: 64806320
Test: Manual test with app using dynamite module

Change-Id: I3abf3ade64aaf689039a515de642759dd39ae6f7