powerpc: dts: turris1x.dts: Add CPLD reboot node

CPLD firmware can reset board by writing value 0x01 at CPLD memory offset
0x0d. Define syscon-reboot node for this reset support.

Fixes: 54c15ec3 ("powerpc: dts: Add DTS file for CZ.NIC Turris 1.x routers")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220713134429.18748-1-pali@kernel.org

arch/powerpc/boot/dts/turris1x.dts

@@ -332,7 +332,7 @@ cpld@3,0 {
 			 * Turris CPLD firmware is open source and available at:
 			 * https://gitlab.nic.cz/turris/hw/turris_cpld/-/blob/master/CZ_NIC_Router_CPLD.v
 			 */
-			compatible = "cznic,turris1x-cpld", "fsl,p1021rdb-pc-cpld", "simple-bus";
+			compatible = "cznic,turris1x-cpld", "fsl,p1021rdb-pc-cpld", "simple-bus", "syscon";
 			reg = <0x3 0x0 0x30>;
 			#address-cells = <1>;
 			#size-cells = <1>;
@@ -352,6 +352,14 @@ watchdog@2 {
 				gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
 			};
 
+			reboot@d {
+				compatible = "syscon-reboot";
+				reg = <0x0d 0x01>;
+				offset = <0x0d>;
+				mask = <0x01>;
+				value = <0x01>;
+			};
+
 			led-controller@13 {
 				/*
 				 * LEDs are controlled by CPLD firmware.