ASoC: mediatek: mt8183-da7219: apply some refactors

1. Moves headset jack to card-specific storage.
2. Removes trailing blank line.
3. Moves card registration to the end of probe.

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20200213112003.4.Ia542007f51d3de753a9e0a83135ee074581dbf71@changeid


Signed-off-by: Mark Brown <broonie@kernel.org>