Have buildTemplateMobileWithRatType take metered parameter

To support unmetered 5g, have buildTemplateMobileWithRatType take
metered parameter to build a template which could be used to filter
an unmetered network.

Bug: 183776809
Test: atest FrameworksNetTests:NetworkStatsServiceTest
Change-Id: Ia310d90eceeb572a35ce9518de02b198cae16705