ASoC: Intel: sof_rt5682: use GFP_KERNEL instead of GFP_ATOMIC

Change the memory allocation flag from GFP_ATOMIC to GFP_KERNEL because
probe of platform device is unlikely a place where cannot sleep.

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Signed-off-by: Mark Brown <broonie@kernel.org>