Codec2Client: Reduce logging

Some non-verbose log messages are less useful now that Codec2 has
stabilized.

Test: make cts -j123 && cts-tradefed run cts-dev -m \
CtsMediaTestCases --compatibility:module-arg \
CtsMediaTestCases:include-annotation:\
android.platform.test.annotations.RequiresDevice

Bug: 139684703
Change-Id: I661260bc3028d057e6809f29a781c6a89f1f06f6