ASoC: msm: qdsp6v2: Update kcontrols for loopback

ASoC framework in kernel 3.10 will create common controls
for widgets that use same kcontrol structure.
Requirement for loopback uses is to have control for each
widget.Change adds kcontrols for individual widgets.

Change-Id: I0209480f15db8a306a529612649ad36f0b723bb9
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>