pinctrl: spear/plgpio: Staticize spear310_o2p

'spear310_o2p' is referenced only in this file.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/spear/pinctrl-plgpio.c b/drivers/pinctrl/spear/pinctrl-plgpio.c
index 6b090be..0a7f0bdb 100644
--- a/drivers/pinctrl/spear/pinctrl-plgpio.c
+++ b/drivers/pinctrl/spear/pinctrl-plgpio.c
@@ -441,7 +441,7 @@
 	return offset;
 }
 
-int spear310_o2p(int offset)
+static int spear310_o2p(int offset)
 {
 	if (offset <= 3)
 		return 101 - offset;