Revert "SoC: soc-pcm: call pcm_new when creating new pcm"

This reverts commit 1a80306d.
This has been done in ASoC with snd_soc_pcm_component_new.
There's no need to make this change.

Change-Id: I72560f6ed265ebf6981ad7a59a3bc75d3e5a3a74
Signed-off-by: Meng Wang <mengw@codeaurora.org>