arm64: dts: rockchip: Enable RTC support for Rock 5B

Add DT node to enable RTC support for Rock 5B board.
Signed-off-by: Shreeya Patel <shreeya.patel@collabora.com>
Reviewed-by: Christopher Obbard <chris.obbard@collabora.com>
Link: https://lore.kernel.org/r/20230405082711.46303-1-shreeya.patel@collabora.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts

@@ -27,6 +27,31 @@ vcc5v0_sys: vcc5v0-sys-regulator {
 	};
 };
 
+&i2c6 {
+	status = "okay";
+
+	hym8563: rtc@51 {
+		compatible = "haoyu,hym8563";
+		reg = <0x51>;
+		#clock-cells = <0>;
+		clock-frequency = <32768>;
+		clock-output-names = "hym8563";
+		pinctrl-names = "default";
+		pinctrl-0 = <&hym8563_int>;
+		interrupt-parent = <&gpio0>;
+		interrupts = <RK_PB0 IRQ_TYPE_LEVEL_LOW>;
+		wakeup-source;
+	};
+};
+
+&pinctrl {
+	hym8563 {
+		hym8563_int: hym8563-int {
+			rockchip,pins = <0 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+};
+
 &sdhci {
 	bus-width = <8>;
 	no-sdio;