Allow Instant Apps access PackageInfo of exposed apps

Instant Apps can only see apps that explicitly expose a component via
android:visibleToInstantApp.

Bug: 34087569
Test: cts-tradefed run commandAndExit cts-dev -m
CtsAppSecurityHostTestCases -t android.appsecurity.cts.EphemeralTest
Change-Id: Ibcba43597f545966abc883e90008369fb20d61ae