MIPS: jz4780: DTS: Probe the jz4740-rtc driver from devicetree

The jz4740-rtc driver supports both jz4740 & jz4780, setup the compatible
string to jz4780.
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Paul Cercueil <paul@crapouillou.net>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17237/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/boot/dts/ingenic/jz4780.dtsi

@@ -44,6 +44,17 @@ cgu: jz4780-cgu@10000000 {
 		#clock-cells = <1>;
 	};
 
+	rtc_dev: rtc@10003000 {
+		compatible = "ingenic,jz4780-rtc";
+		reg = <0x10003000 0x4c>;
+
+		interrupt-parent = <&intc>;
+		interrupts = <32>;
+
+		clocks = <&cgu JZ4780_CLK_RTCLK>;
+		clock-names = "rtc";
+	};
+
 	pinctrl: pin-controller@10010000 {
 		compatible = "ingenic,jz4780-pinctrl";
 		reg = <0x10010000 0x600>;