* For fix the TreeHugger error in pi-dev, cherry pick the ag/4042235 in
master and fix TreeHugger error. Change android.support.v7.* to androidx.*
* Set preference title by bluetooth state
* Enable bluetooth discoverable mode in Connected device page
* Add more test cases for DiscoverableFooterPreferenceController
Bug: 79294219
Test: make -j50 RunSettingsRoboTests
Change-Id: I6d4f8ec3870c43bf48e9666eabd60068aa8950bb
* For fix the TreeHugger error in pi-dev, cherry pick the ag/4042014 in
master and fix TreeHugger error. Change android.support.v7.* to androidx.*
* Dynamicly add preference in controller
* Add test cases for DiscoverableFooterPreferenceController
Bug: 79294219
Test: make -j50 RunSettingsRoboTests
Change-Id: Id4c1e86c9a0a0cd69d8106a18f2cf4a0fa31782b