Right now getSelectableSubscriptionInfoList returns all subscriptions
that are visible and available. But we should only show one per
subscription group. So updating getSelectableSubscriptionInfoList
to make sure of it.
Bug: 126438122
Test: manual - group Fi primary subscriptions and make sure only
one Fi subscription is shown in Settings UI.
Change-Id: I867296b4f8efbdf2e9885ef34dd45806fa0abbca
Merged-In: I867296b4f8efbdf2e9885ef34dd45806fa0abbca
b82864c801