Move ad-hoc dynamic tile injection into FeatureProvider.

Ideally a page should use DashboardFragment and it doesn't need to
handle adding dynamic tiles manually. This method is only designed for
page that are not fully migrated to DashboardFragment yet.

Bug: 32623105
Test: RunSettingsRoboTests
Change-Id: I0cafcddf9a43b164daea500bade869fada5b3f4e