common: Drop linux/delay.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/i2c/soft_i2c.c b/drivers/i2c/soft_i2c.c
index 9ad1c28..1031066 100644
--- a/drivers/i2c/soft_i2c.c
+++ b/drivers/i2c/soft_i2c.c
@@ -25,6 +25,7 @@
 #endif
 #endif
 #include <i2c.h>
+#include <linux/delay.h>
 
 #if defined(CONFIG_SOFT_I2C_GPIO_SCL)
 # include <asm/gpio.h>