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/lan91c96.c b/drivers/net/lan91c96.c
index 255c701..a9fc74b 100644
--- a/drivers/net/lan91c96.c
+++ b/drivers/net/lan91c96.c
@@ -704,7 +704,7 @@
 {
 	uchar v_mac[6];
 
-	if (!eth_getenv_enetaddr("ethaddr", v_mac)) {
+	if (!eth_env_get_enetaddr("ethaddr", v_mac)) {
 		/* get ROM mac value if any */
 		if (!get_rom_mac(dev, v_mac)) {
 			printf("\n*** ERROR: ethaddr is NOT set !!\n");