arch: 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/arch/arm/cpu/armv7/lowlevel_init.S b/arch/arm/cpu/armv7/lowlevel_init.S
index 3c8c07f..a6c844b 100644
--- a/arch/arm/cpu/armv7/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/lowlevel_init.S
@@ -26,7 +26,7 @@
 	/*
 	 * Setup a temporary stack. Global data is not available yet.
 	 */
-#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
+#if defined(CONFIG_XPL_BUILD) && defined(CONFIG_SPL_STACK)
 	ldr	sp, =CONFIG_SPL_STACK
 #else
 	ldr	sp, =SYS_INIT_SP_ADDR
@@ -39,7 +39,7 @@
 	 * Set up global data for boards that still need it. This will be
 	 * removed soon.
 	 */
-#ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_XPL_BUILD
 	ldr	r9, =gdata
 #else
 	sub	sp, sp, #GD_SIZE