pinctrl: pinctrl-nomadik: Append sleepmode property with vendor specific prefixes

Any non-standard property should contain the vendor's identifier which
should be perpended onto the property name followed by a comma. This
aids in name-space collision prevention. This patch ensures the
sleepmode property adheres to the rules.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/pinctrl/pinctrl-nomadik.c b/drivers/pinctrl/pinctrl-nomadik.c
index 3e7e47d..dd9e6f2 100644
--- a/drivers/pinctrl/pinctrl-nomadik.c
+++ b/drivers/pinctrl/pinctrl-nomadik.c
@@ -1198,7 +1198,7 @@
 		if (!pdata)
 			return -ENOMEM;
 
-		if (of_get_property(np, "supports-sleepmode", NULL))
+		if (of_get_property(np, "st,supports-sleepmode", NULL))
 			pdata->supports_sleepmode = true;
 
 		if (of_property_read_u32(np, "gpio-bank", &dev->id)) {