Rename SPL_ETH_SUPPORT to SPL_ETH

Rename this option so that CONFIG_IS_ENABLED can be used with it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/tcl/sl50/board.c b/board/tcl/sl50/board.c
index 4821925..d213608 100644
--- a/board/tcl/sl50/board.c
+++ b/board/tcl/sl50/board.c
@@ -250,7 +250,7 @@
 #endif
 
 #if (defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_SPL_BUILD)) || \
-	(defined(CONFIG_SPL_ETH_SUPPORT) && defined(CONFIG_SPL_BUILD))
+	(defined(CONFIG_SPL_ETH) && defined(CONFIG_SPL_BUILD))
 static void cpsw_control(int enabled)
 {
 	/* VTP can be added here */
@@ -302,7 +302,7 @@
  * Build in only these cases to avoid warnings about unused variables
  * when we build an SPL that has neither option but full U-Boot will.
  */
-#if ((defined(CONFIG_SPL_ETH_SUPPORT) || defined(CONFIG_SPL_USB_ETHER)) \
+#if ((defined(CONFIG_SPL_ETH) || defined(CONFIG_SPL_USB_ETHER)) \
 		&& defined(CONFIG_SPL_BUILD)) || \
 	((defined(CONFIG_DRIVER_TI_CPSW) || \
 	  defined(CONFIG_USB_ETHER) && defined(CONFIG_MUSB_GADGET)) && \
@@ -324,7 +324,7 @@
 	mac_addr[5] = (mac_lo & 0xFF00) >> 8;
 
 #if (defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_SPL_BUILD)) || \
-	(defined(CONFIG_SPL_ETH_SUPPORT) && defined(CONFIG_SPL_BUILD))
+	(defined(CONFIG_SPL_ETH) && defined(CONFIG_SPL_BUILD))
 	if (!env_get("ethaddr")) {
 		printf("<ethaddr> not set. Validating first E-fuse MAC\n");