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/board/logicpd/zoom1/zoom1.c b/board/logicpd/zoom1/zoom1.c
index f76223c..e6c2526 100644
--- a/board/logicpd/zoom1/zoom1.c
+++ b/board/logicpd/zoom1/zoom1.c
@@ -130,7 +130,7 @@
 	uchar eth_addr[6];
 
 	rc = smc911x_initialize(0, CONFIG_SMC911X_BASE);
-	if (!eth_getenv_enetaddr(STR_ENV_ETHADDR, eth_addr)) {
+	if (!eth_env_get_enetaddr(STR_ENV_ETHADDR, eth_addr)) {
 		dev = eth_get_dev_by_index(0);
 		if (dev) {
 			eth_env_set_enetaddr(STR_ENV_ETHADDR, dev->enetaddr);