env: Rename eth_setenv_enetaddr() to eth_env_set_enetaddr()

Rename this function for consistency with env_set().

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index 40be520..424c347 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -1097,7 +1097,7 @@
 		else
 			strcpy(mac, "ethaddr");
 		if (!getenv(mac))
-			eth_setenv_enetaddr(mac, ethaddr);
+			eth_env_set_enetaddr(mac, ethaddr);
 	}
 	return ret;
 err4: