tests/lib/devicetree: Enable for native_sim

Enable these tests which run in native_posix in native_sim,
Switch from native_posix to native_sim as default test platform

Signed-off-by: Alberto Escolar Piedras <[email protected]>

Author: aescolar

tests/lib/devicetree/api/testcase.yaml

@@ -1,13 +1,14 @@
 tests:
   libraries.devicetree.api:
     tags: devicetree
-    # We only need this to run on one platform so use native_posix as it
+    # We only need this to run on one platform so use native_sim as it
     # will mostly likely be the fastest.
     platform_allow:
       - native_posix
+      - native_sim
       - qemu_x86
       - qemu_x86_64
       - qemu_cortex_m3
       - qemu_riscv32
     integration_platforms:
-      - native_posix
+      - native_sim

tests/lib/devicetree/api_ext/testcase.yaml

@@ -1,7 +1,7 @@
 tests:
   libraries.devicetree.api_ext:
     tags: devicetree
-    # We only need this to run on one platform so use native_posix as it
+    # We only need this to run on one platform so use native_sim as it
     # will mostly likely be the fastest.
     integration_platforms:
-      - native_posix
+      - native_sim

tests/lib/devicetree/devices/testcase.yaml

@@ -1,10 +1,10 @@
 tests:
   libraries.devicetree.devices:
     tags: devicetree
-    # We only need this to run on one platform so use native_posix as it
+    # We only need this to run on one platform so use native_sim as it
     # will mostly likely be the fastest.
     integration_platforms:
-      - native_posix
+      - native_sim
     platform_exclude:
       - hsdk
       - hsdk_2cores