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>

board/google/chromebook_coral/coral.c

@@ -147,7 +147,7 @@ static int coral_get_str(struct udevice *dev, int id, size_t size, char *val)
 {
 	int ret;
 
-	if (IS_ENABLED(CONFIG_SPL_BUILD))
+	if (IS_ENABLED(CONFIG_XPL_BUILD))
 		return -ENOSYS;
 
 	switch (id) {

board/google/gru/gru.c

@@ -7,7 +7,7 @@
 #include <init.h>
 #include <asm/arch-rockchip/clock.h>
 
-#ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_XPL_BUILD
 /* provided to defeat compiler optimisation in board_init_f() */
 void gru_dummy_function(int i)
 {
@@ -33,7 +33,7 @@ int board_early_init_f(void)
 }
 #endif
 
-#ifndef CONFIG_SPL_BUILD
+#ifndef CONFIG_XPL_BUILD
 int board_early_init_r(void)
 {
 	struct udevice *clk;

board/google/imx8mq_phanbell/Makefile

@@ -5,7 +5,7 @@
 
 obj-y += imx8mq_phanbell.o
 
-ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_XPL_BUILD
 obj-y += spl.o
 obj-$(CONFIG_IMX8M_LPDDR4) += lpddr4_timing_1g.o
 endif

board/google/veyron/veyron.c

@@ -19,7 +19,7 @@
  * There is a U-Boot driver for this but it may need to add support for the
  * 'voltage-table' property.
  */
-#ifndef CONFIG_SPL_BUILD
+#ifndef CONFIG_XPL_BUILD
 #if !CONFIG_IS_ENABLED(ROCKCHIP_BACK_TO_BROM)
 static int veyron_init(void)
 {