[nrf fromtree] dts: Update SAADC compatible and expand nRF54H20 dtsi

Adds full description of the adc node and support for memory regions.

Signed-off-by: Karol Lasończyk <[email protected]>
(cherry picked from commit 15fa37d)

Author: kl-cruz

dts/bindings/adc/nordic,nrf-saadc.yaml

@@ -5,7 +5,7 @@ description: Nordic Semiconductor nRF family SAADC node
 
 compatible: "nordic,nrf-saadc"
 
-include: adc-controller.yaml
+include: ["adc-controller.yaml", "memory-region.yaml"]
 
 properties:
   reg:

dts/common/nordic/nrf54h20.dtsi

@@ -661,6 +661,14 @@
 				status = "disabled";
 			};
 
+			adc: adc@982000 {
+				compatible = "nordic,nrf-saadc";
+				reg = <0x982000 0x1000>;
+				interrupts = <386 NRF_DEFAULT_IRQ_PRIORITY>;
+				status = "disabled";
+				#io-channel-cells = <1>;
+			};
+
 			comp: comparator@983000 {
 				compatible = "nordic,nrf-comp";
 				reg = <0x983000 0x1000>;