Controls UI - Properly sort, and set default on seed

When seeding is complete, set the default structure to the one with
the max number of controls. Tie breaker is first structure to have the
max. Also, sort the structures, not the serviceinfos.

Fixes: 158768701
Test: disable/enable Home app to test seeding
Change-Id: If5379943afc5ae7cd0d93464ad2e38c8eb01c7f3