dm: Drop the unused arg in uclass_find_device_by_seq()

Now that there is only one sequence number (rather than both requested and
assigned ones) we can simplify this function. Also update its caller to
simplify the logic.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/net/eth-uclass.c b/net/eth-uclass.c
index 4eee011..e2d6731 100644
--- a/net/eth-uclass.c
+++ b/net/eth-uclass.c
@@ -232,7 +232,7 @@
 	/* look for an index after "eth" */
 	index = simple_strtoul(name + 3, NULL, 10);
 
-	retval = uclass_find_device_by_seq(UCLASS_ETH, index, false, &dev);
+	retval = uclass_find_device_by_seq(UCLASS_ETH, index, &dev);
 	if (!retval) {
 		struct eth_pdata *pdata = dev->plat;
 		switch (op) {