System installed launcher can see instant apps

Change-Id: I97f791b61f9b4f7ed33305345bf3d92394b40ae4
Fixes: 38202759
Test: cts-tradefed run commandAndExit cts-dev -m CtsAppSecurityHostTestCases -t android.appsecurity.cts.EphemeralTest
Test: Manual. Create sample app that replaces the launcher to test ability to see ephemeral apps.