leds: leds-bcm6328: Demote kernel-doc abuse

Fixes the following W=1 kernel build warning(s):

 drivers/leds/leds-bcm6328.c:97: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst

Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Fernández Rojas" <noltari@gmail.com>
Cc: Jonas Gorski <jogo@openwrt.org>
Cc: linux-leds@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Pavel Machek <pavel@ucw.cz>

drivers/leds/leds-bcm6328.c

@@ -93,7 +93,7 @@ static unsigned long bcm6328_led_read(void __iomem *reg)
 #endif
 }
 
-/**
+/*
  * LEDMode 64 bits / 24 LEDs
  * bits [31:0] -> LEDs 8-23
  * bits [47:32] -> LEDs 0-7