ASoC: osk5912: Let core to deal with the DAPM widgets

Pass the DAPM widgets/routes via the snd_soc_card struct
to core. With this change we do not need the init function
since the remaining snd_soc_dapm_enable_pin calls are
not needed.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>