Add r_submix to goldfish audio r_submix is required by CDD. Bug: 159945428 Test: g3-app-compat Signed-off-by: Roman Kiryanov <rkir@google.com> Change-Id: Ib22681ef11b1d48f9f92d7f1d0a5ed1622a0ccea Merged-In: Ib22681ef11b1d48f9f92d7f1d0a5ed1622a0ccea