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/data_modul/common/common.c b/board/data_modul/common/common.c
index b4d74a8..b5f8390 100644
--- a/board/data_modul/common/common.c
+++ b/board/data_modul/common/common.c
@@ -72,7 +72,7 @@
 	return 0;
 }
 
-#ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_XPL_BUILD
 static void data_modul_imx_edm_sbc_early_init_f(const iomux_v3_cfg_t wdog_pad)
 {
 	struct wdog_regs *wdog = (struct wdog_regs *)WDOG1_BASE_ADDR;