ASoC: simple-card: simplify code

The DT values are copied to the non-DT structure before being moved to
the card structure.
Set directly the DT values in the card and move the non-DT copy to the
non-DT sequence.

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mark Brown <broonie@linaro.org>