CRAS: Initialize effects flag in cras_client_unified_params_create

If the effects flag isn't initialized, input stream created by the new
version of cras_client_unified_params_create (e.g. ARC++_P input stream)
will be applied random effects.

BUG=b:117471788
TEST=Use Audio Recorder app in ARC++_P and check if the input stream is
     created with effects flag = 0x0 by command
     $ cras_test_client --dump_a | less

Change-Id: I631c12bebd55fe590880763e9a115ca7edbdf563
Reviewed-on: https://chromium-review.googlesource.com/1270320


Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Chih-Yang Hsia <paulhsia@chromium.org>
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>