Disallow system apps to be installed/updated as instant.

Bug: 299441833
Test: atest android.content.pm.cts.PackageManagerTest
(cherry picked from commit 496e78a1951f2ed69290f03c5625c0f8382f4d31)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:c61ee9f45233a35da687942d5af24a5d09568a6c)
Merged-In: Idd89a6dd72f0e68259095f677185f0494391025c
Change-Id: Idd89a6dd72f0e68259095f677185f0494391025c
1 file changed