asoc: codecs: bolero: Do not return error for unused gpio

If soundwire gpio is not used, then no need to return
error if not able to get gpio data.

Change-Id: I97705b49d3b01f99b7a4e91190a15ffb211d32f2
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>