Justify location permission usage by print spooler

Also back up historical printer usage data (used to select default
printer).

The historical printer usage contains the physical location of the
printer (determined by using the permission). The data is only used by
this app and is not sent off the device beside for backup. The backup
data is not further analyzed.

Test: Built
Change-Id: I42f562ef264d49c32ff016ca1677e76cc2a2af13