ASoC: fsl_easrc: fix spelling mistake "prefitler" -> "prefilter"

There is a spelling mistake in a deb_dbg message, fix it.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200423083922.8159-1-colin.king@canonical.com


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