Add APNs for Operator TANGO

Adding APN configuration info for new Operator TANGO(carrier_id:2531).

TANGO-US(carrier_id:10030) - mcc313.mnc770
TANGO-UK(carrier_id:10031) - mcc234.mnc53

Test: Manual
Bug: 210911547
Signed-off-by: Robert Barretto <robertbarretto@tango-networks.com>
Change-Id: Ib171ee97f0fe0212414a1875e29b58440e86ffba