Remove synchronized lock in MdnsServiceTypeClient

Now that all access to MdnsServiceTypeClient parameters is
running on the handler thread, the synchronized lock is no
longer necessary. Therefore, the synchronized lock can be
safely removed from MdnsServiceTypeClient.

Bug: 265787401
Test: atest FrameworksNetTests
Change-Id: I5cd28aa738ea3c199b75097f4583e98be86a6ee7
3 files changed