ASoC: codec: change module folder name to msm-dig-codec for msm8909w

Codec name of msm8909w is msm-dig-codec. When connecting to QACT, it would
read the folder name of /proc/asound/card0/codecs/msm-dig-codec. If it does
not match with codec name, it would fail to connect QACT.
Change folder name to msm-dig-codec to fix this issue.

Change-Id: I71dda8b5f1d23f299c102f546520ba535ab73695
Signed-off-by: Meng Wang <mwang@codeaurora.org>