Filter preferapnset results to only current carrier

Bug: 159772456
Test: atest TelephonyProviderTest
Merged-in: I29b2a143368e4732f67f59059ec281ae62b25a59
Change-Id: I29b2a143368e4732f67f59059ec281ae62b25a59
(cherry picked from commit 748c832f0eedd4a0cab8768a067eb9f68260d5d3)
2 files changed