Import the MdnsConstants and MdnsRecord

Fix the cherry-pick build issue by partially cherry-pick the import
statement.

Bug: 285261577
Test: m
Merged-In: I7c10878129663549c9171c1420b6f399930df2cb
Change-Id: I84e8a253afd09869620ab5ecc39256be3bec1b05
1 file changed