Update DnsResolver AIDL interface version to 2

Generated with:
m dnsresolver_aidl_interface-freeze-api

Bug: 129108902
Test: built, flashed, booted

Merged-In: I0eb4162257cb3db0f2e615761c6ff79174212c62
Merged-In: I955884a9a29b2c6c6bd333609b5e2304c3fb135a
(cherry picked from commit c57738e2341c48ab446020f4e2c4c07dcc486ff7)

Change-Id: I6469a533b081b09641522aa787a36f6166c2ac36
3 files changed