Disallow device admin package and protected packages to be reinstalled as instant.

We should prevent the following types of apps from being reinstalled with
--install-existing as an instant.
(1)device admin package
(2)protected packages

Flag: EXEMPT bugfix

Bug: 341256043
Test: atest android.content.pm.cts.PackageManagerTest
Test: Manual test
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:12b2fd162c91441ea89517cf9e2359ef6aea9f82)
Merged-In: I30244cf18aa6522361f13a1d2119ac5847939ddd
Change-Id: I30244cf18aa6522361f13a1d2119ac5847939ddd