Add a test config template for doh_ffi_test am: cdc6d3bb

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



Change-Id: I2ee2d0a0a91b6c16079a93ac5c25257d9e77a0d7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>