Add CarrierConfig for roaming PLMNS that will need emer DDS switch

When roaming, we assume that the roaming operator will support
control plane fallback for emergency SUPL. For roaming operators
that we know do not support control plane fallback, we must perform
a DDS switch before dialing an emergency number on that operator.

Bug: 144383368
Test: atest TeleServiceTests; manual
Change-Id: I4a033f89610fd409ea81c40230938720ca76541c