Make a few function parameters to be reference

To avoid redundant copies of input data, const reference is used.

Note that there is a behavior change when calling
createMediaFilterEventWithIon: the output buffer will be cleared even if
the operation fails to unblock future calls.

Test: vts-tradefed run vts -m VtsHalTvTunerV1_1TargetTest
Change-Id: Ib26f90930d288738c5b55843e2aecde5318c3786