[nrf fromtree] tests: drivers: retained_mem: api: add support for nrf54h20

retained_mem driver is now compatible with nrf54h20 cpuapp & cpurad.
Also add missing .conf for nrf54l15.

Signed-off-by: Nikodem Kastelik <[email protected]>
(cherry picked from commit e9f1f41)

Author: nika-nordic

tests/drivers/retained_mem/api/boards/nrf54h20dk_nrf54h20_cpuapp.conf

@@ -0,0 +1 @@
+CONFIG_POWEROFF=y

tests/drivers/retained_mem/api/boards/nrf54h20dk_nrf54h20_cpuapp.overlay

@@ -0,0 +1,22 @@
+/ {
+	cpuapp_ram0_ret@22004000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0x22004000 DT_SIZE_K(16)>;
+		zephyr,memory-region = "RetainedMem";
+		status = "okay";
+
+		retainedmem0: retainedmem {
+			compatible = "zephyr,retained-ram";
+			status = "okay";
+		};
+	};
+
+	aliases {
+		retainedmemtestdevice = &retainedmem0;
+	};
+};
+
+&cpuapp_ram0 {
+	reg = <0x22000000 DT_SIZE_K(16)>;
+	ranges = <0x0 0x22000000 0x4000>;
+};

tests/drivers/retained_mem/api/boards/nrf54h20dk_nrf54h20_cpurad.conf

@@ -0,0 +1 @@
+CONFIG_POWEROFF=y

tests/drivers/retained_mem/api/boards/nrf54h20dk_nrf54h20_cpurad.overlay

@@ -0,0 +1,22 @@
+/ {
+	cpurad_ram0_ret@2302c000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0x2302c000 DT_SIZE_K(16)>;
+		zephyr,memory-region = "RetainedMem";
+		status = "okay";
+
+		retainedmem0: retainedmem {
+			compatible = "zephyr,retained-ram";
+			status = "okay";
+		};
+	};
+
+	aliases {
+		retainedmemtestdevice = &retainedmem0;
+	};
+};
+
+&cpurad_ram0 {
+	reg = <0x23000000 DT_SIZE_K(176)>;
+	ranges = <0x0 0x23000000 0x2c000>;
+};

tests/drivers/retained_mem/api/boards/nrf54l15dk_nrf54l15_cpuapp.conf

@@ -0,0 +1 @@
+CONFIG_POWEROFF=y

tests/drivers/retained_mem/api/testcase.yaml

@@ -5,7 +5,11 @@ tests:
       - drivers
       - retained_mem
   drivers.retained_mem.api.ram:
-    platform_allow: qemu_cortex_m3 nrf54l15dk/nrf54l15/cpuapp
+    platform_allow:
+      - qemu_cortex_m3
+      - nrf54h20dk/nrf54h20/cpuapp
+      - nrf54h20dk/nrf54h20/cpurad
+      - nrf54l15dk/nrf54l15/cpuapp
     tags:
       - drivers
       - retained_mem