Add ability to enable developer settings via car settings

Note: This doesn't actually implement any of the developer settings.
Also this change doesn't include code to disable debugging features.
This can be added in a future CL

Bug: 117289912
Test: Build, Manual, robolectric
Change-Id: I52b5e3ecdecdf835b9cafb3c9b413d90f163eab7
6 files changed
tree: d79249d927ae1e4a0da789d4946664b947d1daa2
  1. res/
  2. src/
  3. tests/
  4. Android.mk
  5. AndroidManifest.xml
  6. PREUPLOAD.cfg