arm64: dts: ls1088ardb: add new RTC PCF2131 support

Add RTC PCF2131 node for new ls1088ardb board..

Signed-off-by: Joy Zou <joy.zou@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: 1991Joyzou

arch/arm64/boot/dts/freescale/fsl-ls1088a-rdb.dts

@@ -170,6 +170,13 @@
 				/* IRQ_RTC_B -> IRQ0_B(CPLD) -> IRQ00(CPU), active low */
 				interrupts-extended = <&extirq 0 IRQ_TYPE_LEVEL_LOW>;
 			};
+
+			rtc@53 {
+				compatible = "nxp,pcf2131";
+				reg = <0x53>;
+				/* IRQ_RTC_B -> IRQ0_B(CPLD) -> IRQ00(CPU), active low */
+				interrupts-extended = <&extirq 0 IRQ_TYPE_LEVEL_LOW>;
+			};
 		};
 	};
 };