[DO NOT MERGE] [WifiChannelSwitchStressTest] Add 2 test cases. am: a016410994

Original change: https://googleplex-android-review.googlesource.com/c/platform/tools/test/connectivity/+/12193078

Change-Id: I1bcd819941923c9c61c5d11886067baa7f388ece
tree: 9daa0775ae1547ed0113c1bba3b25f4cbdf0b962
  1. acts/
  2. tools/
  3. wts-acts/
  4. Android.mk
  5. OWNERS
  6. PREUPLOAD.cfg