SearchIndexablesProvider - support for querying for non indexable data keys

SearchIndexablesProvider should be able to send a list of data keys that
should not be indexed (mainly depending on some condition/state from the
device)

- update the contract by adding a new query named queryNonIndexableKeys(...)

Change-Id: Ie720825050acb600dca8ac8fed96fa4f59c3af71
2 files changed