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/gumstix/pepper/board.c b/board/gumstix/pepper/board.c
index 7e8b014..bfc5fd1 100644
--- a/board/gumstix/pepper/board.c
+++ b/board/gumstix/pepper/board.c
@@ -239,7 +239,7 @@
 	uint32_t mac_hi, mac_lo;
 	const char *devname;
 
-	if (!eth_getenv_enetaddr("ethaddr", mac_addr)) {
+	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
 		/* try reading mac address from efuse */
 		mac_lo = readl(&cdev->macid0l);
 		mac_hi = readl(&cdev->macid0h);