pinctrl: apple: use C style comment

This is the preferred comment style.
Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20211121165642.27883-4-joey.gouly@arm.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-apple-gpio.c

@@ -73,7 +73,7 @@ struct regmap_config regmap_config = {
 	.use_relaxed_mmio = true,
 };
 
-// No locking needed to mask/unmask IRQs as the interrupt mode is per pin-register.
+/* No locking needed to mask/unmask IRQs as the interrupt mode is per pin-register. */
 static void apple_gpio_set_reg(struct apple_gpio_pinctrl *pctl,
                                unsigned int pin, u32 mask, u32 value)
 {