ASoC: atmel: sam9g20_wm8731: Remove the unneeded include <linux/i2c.h>

This driver does not use i2c, so there is no point in including
<linux/i2c.h>

Remove it.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/9b39a59f5829d200d7d1fac4e993dbf8ce05836d.1684578051.git.christophe.jaillet@wanadoo.frSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/atmel/sam9g20_wm8731.c

@@ -23,7 +23,6 @@
 #include <linux/timer.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
-#include <linux/i2c.h>
 #include <linux/of.h>
 
 #include <linux/atmel-ssc.h>