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;
diff --git a/board/data_modul/imx8mm_edm_sbc/Makefile b/board/data_modul/imx8mm_edm_sbc/Makefile
index 6d72e93..3d8fedf 100644
--- a/board/data_modul/imx8mm_edm_sbc/Makefile
+++ b/board/data_modul/imx8mm_edm_sbc/Makefile
@@ -4,7 +4,7 @@
 # SPDX-License-Identifier:      GPL-2.0+
 #
 
-ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_XPL_BUILD
 obj-y += spl.o lpddr4_timing_2G_32.o lpddr4_timing_4G_32.o
 else
 obj-y += imx8mm_data_modul_edm_sbc.o
diff --git a/board/data_modul/imx8mp_edm_sbc/Makefile b/board/data_modul/imx8mp_edm_sbc/Makefile
index 28c1d62..7e1fe85 100644
--- a/board/data_modul/imx8mp_edm_sbc/Makefile
+++ b/board/data_modul/imx8mp_edm_sbc/Makefile
@@ -4,7 +4,7 @@
 # SPDX-License-Identifier:      GPL-2.0+
 #
 
-ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_XPL_BUILD
 obj-y += spl.o lpddr4_timing_4G_32.o
 else
 obj-y += imx8mp_data_modul_edm_sbc.o