getPreferenceControllers() -> createPreferenceControllers() for the same
reason as in ag/3647936
Bug: 73668763
Test: robotests
Change-Id: I97670a91a2a38d1c844d1b9d37f4222c5e6f45a0
Creates a new fragment DataUsageSummaryLegacy, which is used
instead of DataUsageSummary when the feature flag is off (default
behavior).
Copies the current DataUsageSummary.java, data_usage.xml, and
DataUsageSummaryActivity to create the legacy versions. This
change allows for uninterupted development of new features in the
DataUsageSummary fragment.
Test: manual
Test: make RunSettingsRoboTests
Bug: 70950124
Change-Id: I9d79e108bbfc1c8ec620f86c0183f4ed3f41c9d7
