ASoC: wm8903: Remove outdated DMIC comment

Support for DMICs was added in commit 97945c46 ("ASoC: WM8903:
Implement DMIC support"). Remove them from the TODO list at the top of
the driver.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230328095819.1632802-1-ckeepax@opensource.cirrus.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm8903.c

@@ -9,7 +9,6 @@
  *
  * TODO:
  *  - TDM mode configuration.
- *  - Digital microphone support.
  */
 
 #include <linux/module.h>