ASoC: Fix snd_soc_get_pcm_runtime usage

Commit [1] changed the snd_soc_get_pcm_runtime to take a dai_link
pointer instead of a string. Patch up the downstream drivers to use
the modified API.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

[1] 4468189f ("ASoC: soc-core: find rtd via dai_link pointer at snd_soc_get_pcm_runtime()")