Revert "Revert "Persist permission state for updated apps synchronously.""

This reverts commit cebec6c3.

The root cause for the previous regression is that when a new user is
added, the replace parameter will be true for every package (despite they
aren't being actually replaced),  thus a synchronous write will be done
for every one of them and the PM lock will be blocked and main thread
will be held for a very long time, causing ANR in apps calling into
system server at the same time.

The proper fix would be renaming the replace parameter and the relevant
flags like UPDATE_PERMISSIONS_REPLACE(_ALL) into something like
regrantInstallPermissions that better describes its use, and then
introduce another parameter that actually represents whether the package
is being replaced. But since we are late in T now and naming is hard,
this double revert simply re-purposes the existing changing package name
to indicate whether there is actually a changing package, and only write
synchronously in that case.

Fixes: 221899913
Test: android.platform.test.scenario.sysui.multiuser.AddGuest
Change-Id: Ifa40b435c2ad8d04050fd5c5972408e61aeea64d