By replacing default summary string with placeholder in xml, the search
index db will add the placeholder as summary instead. This prevents
SettingsIntelligence displaying the search result with a fixed summary,
which may inconsistent with current settings status.
Fixes: 73254496
Test: RunSettingsRoboTests
Change-Id: Ifae8a787ce63fa7a6c7ad5749dab7db72be0263f
Autobrightness preference controller was accidentally removed from
display_settings.xml. Given that no tests were broken and this would
be a disaster for phone buddy & inline actions, I have added another
test which keeps a list of valid controllers that should exist in xml.
When more inline controllers types are added, they will be included
in this test.
Fixes: 72564979
Test: robotests
Change-Id: I40fe18f9118af9cec1c201632742d2949ff64be5
