rtc: sa1100: DT spelling s/interrupt-name/interrupt-names/

Fix typo in interrupt-names
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

Documentation/devicetree/bindings/rtc/sa1100-rtc.txt

@@ -13,5 +13,5 @@ Example:
 		compatible = "mrvl,mmp-rtc";
 		reg = <0xd4010000 0x1000>;
 		interrupts = <5>, <6>;
-		interrupt-name = "rtc 1Hz", "rtc alarm";
+		interrupt-names = "rtc 1Hz", "rtc alarm";
 	};