riscv: dts: sifive unmatched: Expose the PMIC sub-functions

These sub-functions are available in the chip revision on this board, so
expose them.
Signed-off-by: NVincent Pelletier <plr.vincent@gmail.com>
Signed-off-by: NPalmer Dabbelt <palmer@rivosinc.com>

arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts

@@ -76,6 +76,18 @@
 		interrupts = <1 IRQ_TYPE_LEVEL_LOW>;
 		interrupt-controller;
 
+		onkey {
+			compatible = "dlg,da9063-onkey";
+		};
+
+		rtc {
+			compatible = "dlg,da9063-rtc";
+		};
+
+		wdt {
+			compatible = "dlg,da9063-watchdog";
+		};
+
 		regulators {
 			vdd_bcore1: bcore1 {
 				regulator-min-microvolt = <900000>;