snippets: add USB/IP on native simulator snippet

Snippet that helps to build USB device samples with virtual device and
host controllers and USBIP support.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
diff --git a/snippets/usbip-native-sim/snippet.yml b/snippets/usbip-native-sim/snippet.yml
new file mode 100644
index 0000000..794930c
--- /dev/null
+++ b/snippets/usbip-native-sim/snippet.yml
@@ -0,0 +1,4 @@
+name: usbip-native-sim
+append:
+  EXTRA_CONF_FILE: usbip-native-sim.conf
+  EXTRA_DTC_OVERLAY_FILE: usbip-native-sim.overlay