env: Rename eth_getenv_enetaddr() to eth_env_get_enetaddr()

Rename this function for consistency with env_get().

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/net/ftgmac100.c b/drivers/net/ftgmac100.c
index 5ccc4be..d0939e9 100644
--- a/drivers/net/ftgmac100.c
+++ b/drivers/net/ftgmac100.c
@@ -346,7 +346,7 @@
 
 static void ftgmac100_set_mac_from_env(struct eth_device *dev)
 {
-	eth_getenv_enetaddr("ethaddr", dev->enetaddr);
+	eth_env_get_enetaddr("ethaddr", dev->enetaddr);
 
 	ftgmac100_set_mac(dev, dev->enetaddr);
 }