samples: ipc_service: Make space for new backends

Move the backend-specific samples to a new subdirectory to make space
for new samples.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>

samples/subsys/ipc/ipc_service/static_vrings_mi/README.rst

@@ -16,7 +16,7 @@ Building the application for nrf5340dk_nrf5340_cpuapp
 *****************************************************
 
 .. zephyr-app-commands::
-   :zephyr-app: samples/subsys/ipc/ipc_service
+   :zephyr-app: samples/subsys/ipc/ipc_service/static_vrings_mi
    :board: nrf5340dk_nrf5340_cpuapp
    :goals: debug
 
@@ -72,12 +72,12 @@ Building the application for bl5340_dvk_cpuapp
 **********************************************
 
 .. zephyr-app-commands::
-   :zephyr-app: samples/subsys/ipc/ipc_service
+   :zephyr-app: samples/subsys/ipc/ipc_service/static_vrings_mi
    :board: bl5340_dvk_cpuapp
    :goals: debug
 
 .. zephyr-app-commands::
-   :zephyr-app: samples/subsys/ipc/ipc_service/remote
+   :zephyr-app: samples/subsys/ipc/ipc_service/static_vrings_mi/remote
    :board: bl5340_dvk_cpunet
    :goals: debug
 

samples/subsys/ipc/ipc_service/static_vrings_mi/sample.yaml

@@ -1,11 +1,11 @@
 sample:
     description: This app provides an example of how to integrate
-        IPC Service with Zephyr.
-    name: IPC Service example integration
+        IPC Service with Zephyr (static_vrings_mi backend)
+    name: IPC Service example integration (static_vrings_mi backend)
 tests:
-    sample.ipc.rpmsg_service.nrf:
+    sample.ipc.static_vrings_mi.nrf:
         platform_allow: nrf5340dk_nrf5340_cpuapp bl5340_dvk_cpuapp
         integration_platforms:
           - nrf5340dk_nrf5340_cpuapp bl5340_dvk_cpuapp
-        tags: ipm
+        tags: ipc
         build_only: true