pwm: img: Drop write-only variable from driver private data

struct img_pwm_chip::dev is only assigned to, but the member variable is
never used. So drop it.

Link: https://lore.kernel.org/r/7b7de753caa453c7fe591228c9a45d0baf8b5878.1707900770.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/pwm/pwm-img.c

@@ -59,7 +59,6 @@ struct img_pwm_soc_data {
 };
 
 struct img_pwm_chip {
-	struct device	*dev;
 	struct pwm_chip	chip;
 	struct clk	*pwm_clk;
 	struct clk	*sys_clk;
@@ -265,8 +264,6 @@ static int img_pwm_probe(struct platform_device *pdev)
 	if (!imgchip)
 		return -ENOMEM;
 
-	imgchip->dev = &pdev->dev;
-
 	imgchip->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(imgchip->base))
 		return PTR_ERR(imgchip->base);