ASoC: core: init delayed_work for codec-codec links

We must init the delayed_work for codec-codec links
otherwise shutting down the DAI chain will fault when
calling flush_delayed_work_sync() on the linked DAI.

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>