ASoC: atmel: mchp-pdmc: Fix spelling mistake "microchopnes" -> "microphones"

There is a spelling mistake in a dev_info message. Fix it.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Link: https://lore.kernel.org/r/20220309164116.178685-1-colin.i.king@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>