Deprecate testRndis as RNDIS is no longer enabled by default in GKI am: cc4266c9a3 am: f437c2c920

Original change: https://android-review.googlesource.com/c/platform/test/vts-testcase/hal/+/2256769

Change-Id: I353411182e8173a6422c8f3831863944b93f7560
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>