vpu: mount myd_ion device for topology hints to work

Previously, /dev/ion device was just arbitrary string and the plugin
did not need the device for anything. After adding the checks for
topology hints, the device node must be bind mounted in the plugin
container.

Signed-off-by: Alek Du <alek.du@intel.com>

deployments/vpu_plugin/base/intel-vpu-plugin.yaml

@@ -25,6 +25,9 @@ spec:
         securityContext:
           readOnlyRootFilesystem: true
         volumeMounts:
+        - name: devion
+          mountPath: /dev/ion
+          readOnly: true
         - name: devfs
           mountPath: /dev/bus/usb
           readOnly: true
@@ -39,6 +42,10 @@ spec:
         - name: kubeletsockets
           mountPath: /var/lib/kubelet/device-plugins
       volumes:
+      - name: devion
+        hostPath:
+           path: /dev/ion
+           type: CharDevice
       - name: devfs
         hostPath:
           path: /dev/bus/usb