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/freescale/ls1028a/ls1028a.c b/board/freescale/ls1028a/ls1028a.c
index e01b5a8..db94d9c 100644
--- a/board/freescale/ls1028a/ls1028a.c
+++ b/board/freescale/ls1028a/ls1028a.c
@@ -123,7 +123,7 @@
 	u8 uart;
 #endif
 
-#if defined(CONFIG_SYS_I2C_EARLY_INIT) && defined(CONFIG_SPL_BUILD)
+#if defined(CONFIG_SYS_I2C_EARLY_INIT) && defined(CONFIG_XPL_BUILD)
 	i2c_early_init_f();
 #endif