arm: mvebu: add RTC support for Armada 370 and Armada XP

The Armada 370 and Armada XP Socs have the same controller that the one
used in the orion platforms.  This patch updates the device tree for
these SoCs.
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: NAndrew Lunn <andrew@lunn.ch>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/arm/boot/dts/armada-370-xp.dtsi

@@ -131,6 +131,12 @@
 			clocks = <&coreclk 0>;
 			status = "disabled";
 		};
+
+		rtc@10300 {
+			compatible = "marvell,orion-rtc";
+			reg = <0xd0010300 0x20>;
+			interrupts = <50>;
+		};
 	};
 };