Make usages aware of multiple users.

If work profiles are enabled, we previously created one
AppPermissionUsage for both versions of the app.  This modifies the
loading process so that we create two separate usages.

It also modifies AppPermissionUsageFragment to take in the desired
user as an argument.

Fixes: 122769169
Fixes: 122766615
Test: Open Permissions Hub with work profile, see separate copies of
apps for normal and work profiles.
Test: Open AppPermissionUsageFragment for normal and work profiles.

Change-Id: Ib94c1e89d9b9873bd7732bee40deaeef68d4f1df