ASoC: msm: Add routing controls from MM6 to MM8 to MI2S_RX_AUDIO

Add the routing between QUAT_MI2S_RX and Multimedia6-8 for
multi tunnel playback.

CRs-fixed: 566756
Change-Id: I96fa1728d6866b96574bb5d0f38e9c05d92d799e
Signed-off-by: Damir Didjusto <damird@codeaurora.org>