gpio: correctly use const char * const

On my previous patch I was overly hasty and made the suffixes string
array
const char const *suffixes, instaed of const char * const suffixes. This
patch corrects that

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 9d2a371..c926641 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1657,7 +1657,7 @@
 				      unsigned int idx,
 				      enum gpio_lookup_flags *flags)
 {
-	static const char const *suffixes[] = { "gpios", "gpio" };
+	static const char * const suffixes[] = { "gpios", "gpio" };
 	char prop_name[32]; /* 32 is max size of property name */
 	enum of_gpio_flags of_flags;
 	struct gpio_desc *desc;