Adapt csi-driver-node PSP

Co-authored-by: vpnachev <vladimir.nachev@sap.com>
Signed-off-by: ialidzhikov <i.alidjikov@gmail.com>

```improvement user
An issue preventing csi-driver-node Pods to be created when Shoot specifies `.spec.kubernetes.allowPrivilegedContainers=false` is now fixed.
```

Author: ialidzhikov

charts/internal/shoot-system-components/charts/csi-driver-node/templates/podsecuritypolicy.yaml

@@ -6,6 +6,8 @@ metadata:
 spec:
   privileged: true
   allowPrivilegeEscalation: true
+  allowedCapabilities:
+  - SYS_ADMIN
   volumes:
   - hostPath
   - secret