Add a test config template for doh_ffi_test am: cdc6d3bb am: be8d1a36

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



Change-Id: I5c18ee4869d16a451bc75727b0b435e44e935848
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>