ASoC: codecs: wcd938x: fix unused variable warning

This patch fixes below

	warning: unused variable wcd938x_dt_match

by placing device match table under CONFIG_OF

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210621134502.19537-1-srinivas.kandagatla@linaro.org


Signed-off-by: Mark Brown <broonie@kernel.org>