ASoC: remove the usage of dev_set_name in msm-transcode-loopback

Remove the invocation of function dev_set_name from the driver
msm-transcode-loopback since it is not needed anymore.

Change-Id: If47a053ccec35b913b6cb2456bbfcec91933b0bf
Signed-off-by: Xiaoyu Ye <benyxy@codeaurora.org>