ASoC: Remove duplicate linux/delay.h inclusion.

It's enough to include linux/delay.h just once in
sound/soc/codecs/wm8915.c, so remove the duplicate.
Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8915.c

@@ -19,7 +19,6 @@
 #include <linux/gcd.h>
 #include <linux/gpio.h>
 #include <linux/i2c.h>
-#include <linux/delay.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>