Add a test config template for doh_ffi_test am: cdc6d3bb am: a9bb2540

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2306303



Change-Id: I6730a973664338a9e08b95248fcd079c5b94431b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>