Add ClockOptionsProvider for more realistic previews.

This change enables the picker app to move to the new
ContentProvider but it doesn't change any of the
assets. A follow-up change will dynamically generate
a realistic preview image from the clock.

Bug: 123704608
Test: atest on new tests ClockInfoTest and ClockOptionsProviderTest
Change-Id: I744c8dd063f6aa112e290fcf54cdc0e0b1377a0e