Fix DnsResolver MTS tests failure in Q platform

After aosp/1640364, soong always respects min_sdk_version
to build the aidl library.
Hence, explicitly set the min_sdk_version for all the binder
interface used by DnsResolver tests would fix the compatible problem.

Bug: 182085418
Test: forrest, manual test in Q device
Change-Id: I9c344414101c00208476ca1c22992b999b4de1ab