ASoC: add missing snd_soc_component_set_jack

commit 44c07365 ("ASoC: add Component level set_jack") added new
snd_soc_component_set_jack(), but it didn't add definition on soc.h.
This patch adds it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>