Add APIs for carrier network selection

Add APIs to temporarily disabled non carrier merged wifi networks, and
another API to re-enable the disabled networks.

Bug: 173054916
Test: atest android.net.wifi
CTS-Coverage-Bug: 173152650

Change-Id: Ib8e6b248d6903a3b8c0c1dd94b2dd4e668aae1f0
4 files changed