ASoC: codecs: wcd938x/wcd934x: loglevel fix and

Merge series from Johan Hovold <johan+linaro@kernel.org>:

When investigating a race in the wcd938x driver I noticed that the MBHC
impedance measurements where printed at error loglevel which is clearly
wrong.

Fix that, and clean up the logging somewhat by using dev_printk() and
addressing some style issues.

Included are also two patches that drop the bogus inline keywords from
the functions involved.