ASoC: simple-card: fix mic jack initialization

Initialize asoc_simple_card_init_mic with the correct struct
asoc_simple_jack.

Fixes: 9eac3618 ("ASoC: simple-card: add new asoc_simple_jack and use it")
Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>