QUERY_USERS is a privileged permission

Unlike MANAGE_USERS, the weaker QUERY_USERS was not marked as a
privileged permission, making it (ironically) harder to get. To
encourage apps for which the weaker permission suffices to use that
weaker permission instead, we change it to privileged.

Bug: 272303195
Test: builds and boots
Test: atest IntentResolverUnitTests (invokes a test app that uses this
permission)

Change-Id: I289023f3007fe1a06c3ed517c397e5b57068b468