ASoC: wm_adsp: Include array_size.h

Explicitly #include array_size.h for the ARRAY_SIZE() macro.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://msgid.link/r/20240410161312.22313-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>