pinctrl/sirf: fix sirfsoc_get_group_pins prototype

fix sirfsoc_get_group_pins prototype introduced in 7e570f97, we
missed to de-constify a pointer.
Signed-off-by: NJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinmux-sirf.c

@@ -870,7 +870,7 @@ static const char *sirfsoc_get_group_name(struct pinctrl_dev *pctldev,
 
 static int sirfsoc_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
 			       const unsigned **pins,
-			       const unsigned *num_pins)
+			       unsigned *num_pins)
 {
 	if (selector >= ARRAY_SIZE(sirfsoc_pin_groups))
 		return -EINVAL;