pinctrl: pinctrl-single: add missing double quote

add a missing double quote for compatible property for pmx_wkup.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Rob Landley <rob@landley.net>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt

@@ -126,7 +126,7 @@ pmx_core: pinmux@4a100040 {
 
 /* second controller instance for pins in wkup domain */
 pmx_wkup: pinmux@4a31e040 {
-	compatible = "pinctrl-single;
+	compatible = "pinctrl-single";
 	reg = <0x4a31e040 0x0038>;
 	#address-cells = <1>;
 	#size-cells = <0>;