board: Use CONFIG_XPL_BUILD instead of CONFIG_SPL_BUILD

Use the new symbol to refer to any 'SPL' build, including TPL and VPL

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/grinn/chiliboard/board.c b/board/grinn/chiliboard/board.c
index e0eb8aa..d5491d5 100644
--- a/board/grinn/chiliboard/board.c
+++ b/board/grinn/chiliboard/board.c
@@ -104,7 +104,7 @@
 #ifdef CONFIG_BOARD_LATE_INIT
 int board_late_init(void)
 {
-#if !defined(CONFIG_SPL_BUILD)
+#if !defined(CONFIG_XPL_BUILD)
 	uint8_t mac_addr[6];
 	uint32_t mac_hi, mac_lo;