asoc: codecs: wcd934x: add stub functions for codec APIs

If wcd934x config is removed, need to stub out the
APIs to load any dependent audio modules and enumerate
sound card.

Change-Id: If885d4d1f0ee83448ac41ed66b51f078978cb7d1
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>