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: Ib2f69882620465b44a6e783d9b1b3a98647b40ac
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>