UPSTREAM: ASoC: wm97xx: fix compilation corner case

When the old AC97 is not used, CONFIG_SND_SOC_AC97_BUS is not
defined. As a consequence, in the error path, snd_soc_free_ac97_codec()
is not defined and triggers a compilation error.

Fix it for wm9705 and wm9712, as wm9713 is correctly written.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 6bd25aae)

BUG=b:110025789
TEST=Test Audio use cases with full SOF 0.6 rebase release series applied.

Change-Id: I2acf0edd5f84deca7d5951f8fddde2f8e49771e0
Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1410708


Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Kamal Ap <kamal.ap@intel.com>