Fix typo in AWSMachineClass (#467)

Author: hardikdr

kubernetes/machine_classes/aws-machine-class.yaml

@@ -25,13 +25,13 @@ spec:
     namespace: default  # Namespace
     name: test-secret # Name of the secret
   blockDevices:
-    - name: /root
+    - deviceName: /root
       ebs:
         volumeSize: 50  # Size of the root block device
         volumeType: gp2 # Type of the root block device
         encrypted: false
         deleteOnTermination: true
-    - name: /dev/sdb
+    - deviceName: /dev/sdb
       ebs:
         volumeSize: 50  # Size of the root block device
         volumeType: gp2 # Type of the root block device