ASoC: max98090: Remove unnecessary snd_soc_dapm_sync()

max98090_jack_work() doesn't modify the DAPM graph other than what's done
in snd_soc_jack_report(). snd_soc_jack_report() already calls
snd_soc_dapm_sync() internally, so there is no need to call it manually
and can be removed.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>