ASoC: snd_soc_new_{mixer,mux,pga} make sure to use right DAPM context

ASoC: snd_soc_new_{mixer,mux,pga} make sure to use right DAPM context

commit 4b80b8c2eee5282dab57f094fd3893c0c09f750c upstream.

Currently it is possible that snd_soc_new_{mixer,mux,pga} is called with a
DAPM context not matching the widgets context. This can lead to a wrong
prefix_len calculation, which will result in undefined behaviour. To avoid
this always use the DAPM context from the widget itself.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>