Move getNetworkCountryIso impl from TM to PIM.

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

Bug: 63050313
Test: no compilation errors
Change-Id: I8463af8ed427b73b57a4076c0ff79f055c697657
2 files changed