Allow unsuspending critical packages

PackageManager prevents certain packages from being suspended to ensure
device is in a sane state. It should not disallow unsuspening these
packages for the same reason.

Test: Existing tests:
atest FrameworksServicesTests:SuspendPackagesTest
Manually, changed the default dialer, then
adb shell pm suspend com.android.dialer
change the default dialer to com.android.dialer, then
adb shell pm unsuspend com.android.dialer
should succeeed.

Bug: 79846500
Change-Id: Ie198f61bf3b092e497f978e60a27f9d52cdda9c7