Move Duo related constants out of interface

Fixed notifying for Duo missed calls using the new constants to check if a call is a Duo call.

Bug: 66946794
Test: existing tests, manual
PiperOrigin-RevId: 172400311
Change-Id: I84ec0ac5c933cf1aec68b6d1f422c2effe6b69ec
8 files changed
tree: 91fb2d0f5c065f024a7332ec664c794cdf30f413
  1. assets/
  2. java/
  3. Android.mk
  4. AndroidManifest.xml
  5. CONTRIBUTING
  6. LICENSE