pinctrl/nomadik: add device tree bindings for db8540

This adds a simple device tree binding for db8540 boards.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@stericsson.com>
Reviewed-by: Philippe Langlais <philippe.langlais@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-nomadik.c

@@ -2111,6 +2111,10 @@ static const struct of_device_id nmk_pinctrl_match[] = {
 		.compatible = "stericsson,nmk-pinctrl",
 		.data = (void *)PINCTRL_NMK_DB8500,
 	},
+	{
+		.compatible = "stericsson,nmk-pinctrl-db8540",
+		.data = (void *)PINCTRL_NMK_DB8540,
+	},
 	{},
 };