Implement getNetworkCountryIso in PhoneInterfaceManager.

This moves the implementation from TelephonyManager into
PhoneInterfaceManager so that we can perform an additional IWLAN check.

Bug: 63050313
Test: no compilation errors
Change-Id: I69a36d085f5cca13a225d8e15ff521b4017ba1ab
(cherry picked from commit 4074d8f99acd9fc3a805d52ededcc24a7e4141d8)
1 file changed