media: lm3560: add a missing kernel-doc parameter

Fix this warning:
	drivers/media/i2c/lm3560.c:69: warning: No description found for parameter 'dev'
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/i2c/lm3560.c

@@ -50,6 +50,7 @@ enum led_enable {
 /**
  * struct lm3560_flash
  *
+ * @dev: pointer to &struct device
  * @pdata: platform data
  * @regmap: reg. map for i2c
  * @lock: muxtex for serial access.