samples sntp_client: Move from native_posix to native_sim

* In the sample doc, replace native_posix references with native_sim
* Enable native_sim in the sample yaml

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

samples/net/sockets/sntp_client/README.rst

@@ -24,7 +24,7 @@ printed.
 
 See the `net-tools`_ project for more details.
 
-This sample can be built and executed on QEMU or native_posix board as
+This sample can be built and executed on QEMU or native_sim board as
 described in :ref:`networking_with_qemu`.
 
 .. _`net-tools`: https://github.com/zephyrproject-rtos/net-tools

samples/net/sockets/sntp_client/sample.yaml

@@ -6,13 +6,19 @@ common:
   tags: net
 tests:
   sample.net.sockets.sntp_client:
-    platform_allow: qemu_x86
+    platform_allow:
+      - qemu_x86
+      - native_sim
   sample.net.sockets.sntp_client.posix_names:
-    platform_allow: qemu_x86
+    platform_allow:
+      - qemu_x86
+      - native_sim
     extra_configs:
       - CONFIG_NET_SOCKETS_POSIX_NAMES=y
   sample.net.sockets.sntp_client.posix:
-    platform_allow: qemu_x86
+    platform_allow:
+      - qemu_x86
+      - native_sim
     extra_configs:
       - CONFIG_NET_SOCKETS_POSIX_NAMES=n
       - CONFIG_POSIX_API=y