Address a TODO in TetheringConfiguration to use a dependency object instead of static mocking on DeviceConfig. This avoids TetheringConfiguration dependencies on internal implementation of DeviceConfigUtils, unblocking changes in DeviceConfigUtils. Bug: 279108992 Test: atest TetheringTests (cherry picked from https://android-review.googlesource.com/q/commit:6d38c018523688004b3d43e6794bec5eba8aee03) Merged-In: I252eaadff85fa47b894e989b4f2527b00c5dca56 Change-Id: I252eaadff85fa47b894e989b4f2527b00c5dca56