fix sku type to support multiple windows node pool

Author: paulyufan2

hack/aks/Makefile

@@ -117,7 +117,7 @@ overlay-up: rg-up overlay-net-up ## Brings up an Overlay AzCNI cluster
 	$(AZCLI) aks create -n $(CLUSTER) -g $(GROUP) -l $(REGION) \
 		--node-count $(NODE_COUNT) \
 		--node-vm-size $(VM_SIZE) \
-		--load-balancer-sku standard \
+		--load-balancer-sku basic \
 		--network-plugin azure \
 		--network-plugin-mode overlay \
 		--pod-cidr 192.168.0.0/16 \