leds: lp3952: Include the right header

This driver is using the GPIO descriptor API properly
as it should be but is including the legacy GPIO header
<linux/gpio.h>. Fix it by including <linux/gpio/consumer.h>
instead.

Cc: Tony Makkiel <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Signed-off-by: Pavel Machek <[e-mail]>

drivers/leds/leds-lp3952.c

···
  */
 
 #include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/io.h>
 #include <linux/kernel.h>