Allow the launcher to get all instant apps

Change-Id: Ie0381d01fe8cd5293a0a3671c1bdf497ca5c5783
Fixes: 63814920
Test: Manual
Test: Make and install a launcher that calls the protected APIs
Test: Run launcher, see that it gets a security exception
Test: Make the launcher the default, see that it gets a security exception
Test: Install the launcher as a system app
Test: Run the launcher, see that it gets a security exception
Test: Make the launcher the default, see that the API works