Allow internal services access to instant apps

Any system UID [those with a UID < Process.FIRST_APPLICATION_UID] should be
able to see instant applications. These are trusted processes and will often
need to verify permissions of the calling instant app.

Change-Id: I4ec899ffd45d931a17d4ea0bfacf3004d3e074ef
Fixes: 67849834
Test: Manual.
Test: Install hellozip_base.apk from bug:
Test:  $ adb install --instantapp -i com.android.vending hellozip_base.apk
Test: Run hellozip
Test:  $ adb shell am start -a android.intent.action.VIEW -c android.intent.category.BROWSABLE -d https://hello.samples.androidinstantapps.com/hello
Test: Try to capture a photo and see that the app crashes with a SecurityException before the patch and that a photo is taken after the patch
Test: Try to record audio and see that the app crashes with an IllegalStateException before the patch and that the app doesn't crash after the patch
(cherry picked from commit 17e40d2f)