samples: ipc: static_vrings: Exclude unsupported platforms

List of allowed platforms for this sample was
changed in PR #85997. This enabled more
platforms including those that are not needed.
This commit excludes nrf5340/cpuapp_ns and
nrf5340/cpunet platforms since they are not
supported by this sample.

Signed-off-by: Dominik Kilian <Dominik.Kilian@nordicsemi.no>

Author: doki-nordic

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

@@ -3,6 +3,9 @@ sample:
 tests:
   sample.ipc.static_vrings:
     filter: dt_compat_enabled("zephyr,ipc-openamp-static-vrings")
+    platform_exclude:
+      - nrf5340dk/nrf5340/cpuapp_ns
+      - nrf5340dk/nrf5340/cpunet
     integration_platforms:
       - nrf5340dk/nrf5340/cpuapp
       - nrf5340bsim/nrf5340/cpuapp