arm64: dts: imx93: Add the bbnsm dts node

Add the bbnsm node for RTC & ON/OFF button support
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx93.dtsi

@@ -243,6 +243,22 @@ iomuxc: pinctrl@443c0000 {
 				status = "okay";
 			};
 
+			bbnsm: bbnsm@44440000 {
+				compatible = "nxp,imx93-bbnsm", "syscon", "simple-mfd";
+				reg = <0x44440000 0x10000>;
+
+				bbnsm_rtc: rtc {
+					compatible = "nxp,imx93-bbnsm-rtc";
+					interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>;
+				};
+
+				bbnsm_pwrkey: pwrkey {
+					compatible = "nxp,imx93-bbnsm-pwrkey";
+					interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>;
+					linux,code = <KEY_POWER>;
+				};
+			};
+
 			clk: clock-controller@44450000 {
 				compatible = "fsl,imx93-ccm";
 				reg = <0x44450000 0x10000>;