Make sure data is enabled on the non-primary sub's voice call

Also make sure PhoneFactory is initialized before calling
getDefaultPhone

PhoneFactory.makeDefaultPhones leads to a call to
DataEnabledOverride.getCurrentConditions which in turn
calls PhoneFactory.getPhone() which in that scenario
would return null

Bug: 135271148
Test: manual verification and unittests
Change-Id: Ib5ac1be78556d079744bffca4b731df6ba108429