The function is only used locally, make it static.

Fixes the following warning from sparse:
	sound/soc/soc-core.c:1644:22: warning: symbol 'soc_find_matching_codec' was not declared. Should it be static?

Fixes: 3ca041ed ("ASoC: dt: Allow Aux Codecs to be specified using DT")
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Acked-By: NSebastian Reichel <sre@kernel.org>
Signed-off-by: NMark Brown <broonie@linaro.org>