ASoC: msm: qdsp6v2: Change error message to debug in Listen API

Listesn get API prints error message when called for non slimbus
ports. Change this to debug message. The API is called on deroute
and message is printed for playback on non slimbus ports like
RT proxy port.

CRs-Fixed: 471793
Change-Id: I8a2e7d65610507f586d02a26bdf3f0571f7a6f65
Signed-off-by: Krishnankutty Kolathappilly <kkolat@codeaurora.org>