osd: update existing OSDs with deviceClass

If we apply useAllNodes to false for the current deployment,
the OSDs should get updated with the individual nodes values and config,
The deviceClass was not updating to the existing OSDs because there was
bug in the check.
The check osdInfo.DeviceClass == "" which should be
checked like this osdInfo.DeviceClass == "None"

Updated the code so OSDs can make use of the devices present

Signed-off-by: parth-gr <paarora@redhat.com>

pkg/operator/ceph/cluster/osd/update.go

@@ -126,7 +126,7 @@ func (c *updateConfig) updateExistingOSDs(errs *provisionErrors) {
 		}
 
 		// backward compatibility for old deployments
-		if osdInfo.DeviceClass == "" {
+		if osdInfo.DeviceClass == "" || osdInfo.DeviceClass == "None" {
 			deviceClassInfo, err := cephclient.OSDDeviceClasses(c.cluster.context, c.cluster.clusterInfo, []string{strconv.Itoa(osdID)})
 			if err != nil {
 				logger.Errorf("failed to get device class for existing deployment %q. %v", depName, err)