[nrf noup] samples: basic: blinky: add eGPIO tests configuration

Add yaml configurations to enable eGPIO tests with sysbuild
and different backends.

Signed-off-by: Jakub Zymelka <jakub.zymelka@nordicsemi.no>

samples/basic/blinky/boards/nrf54l15dk_nrf54l15_cpuapp_egpio.overlay

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+&led0 {
+	gpios = <&egpio 7 GPIO_ACTIVE_HIGH>;
+};

samples/basic/blinky/sample.yaml

@@ -1,12 +1,51 @@
 sample:
   name: Blinky Sample
+common:
+  tags:
+    - LED
+    - gpio
+  depends_on: gpio
 tests:
   sample.basic.blinky:
-    tags:
-      - LED
-      - gpio
     filter: dt_enabled_alias_with_parent_compat("led0", "gpio-leds")
-    depends_on: gpio
     harness: led
     integration_platforms:
       - frdm_k64f
+
+  sample.basic.blinky.egpio_icmsg:
+    sysbuild: true
+    platform_allow:
+      - nrf54l15dk/nrf54l15/cpuapp
+    integration_platforms:
+      - nrf54l15dk/nrf54l15/cpuapp
+    extra_args: blinky_SNIPPET=emulated-gpio-icmsg
+                SB_CONFIG_SDP=y
+                SB_CONFIG_EGPIO_FLPR_APPLICATION=y
+                SB_CONFIG_PARTITION_MANAGER=n
+                EXTRA_DTC_OVERLAY_FILE="./boards/nrf54l15dk_nrf54l15_cpuapp_egpio.overlay"
+    harness: console
+    harness_config:
+      type: multi_line
+      ordered: true
+      regex:
+        - "LED state: ON"
+        - "LED state: OFF"
+
+  sample.basic.blinky.egpio_mbox:
+    sysbuild: true
+    platform_allow:
+      - nrf54l15dk/nrf54l15/cpuapp
+    integration_platforms:
+      - nrf54l15dk/nrf54l15/cpuapp
+    extra_args: blinky_SNIPPET=emulated-gpio-mbox
+                SB_CONFIG_SDP=y
+                SB_CONFIG_EGPIO_FLPR_APPLICATION=y
+                SB_CONFIG_PARTITION_MANAGER=n
+                EXTRA_DTC_OVERLAY_FILE="./boards/nrf54l15dk_nrf54l15_cpuapp_egpio.overlay"
+    harness: console
+    harness_config:
+      type: multi_line
+      ordered: true
+      regex:
+        - "LED state: ON"
+        - "LED state: OFF"