Screen now handles data role and power
role switching as separate categories.
Change the UsbBackend api to use predefined
constants. Split out data and power direction
changes into separate functions.
Add tests for new controllers and new backend
functionality.
Bug: 72829348
Test: passes
Change-Id: I28b96cf49463fa4f3a4b6be41c57d5841731fbd6
Also updated UsbBackend to use the new UsbFunctions
api.
Added new unit tests for UsbDetailsHeaderController
and UsbDetailsProfilesController.
Bug: 69333961
Test: make RunSettingsRoboTests
Change-Id: I133750190bb61dfe0e20b06f50e50ea13b347f1e
