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/include/asm/fsl_secure_boot.h b/arch/arm/include/asm/fsl_secure_boot.h
index 15627c9..382a6d4 100644
--- a/arch/arm/include/asm/fsl_secure_boot.h
+++ b/arch/arm/include/asm/fsl_secure_boot.h
@@ -8,8 +8,8 @@
 #define __FSL_SECURE_BOOT_H
 
 #ifdef CONFIG_CHAIN_OF_TRUST
-#ifndef CONFIG_SPL_BUILD
+#ifndef CONFIG_XPL_BUILD
 
-#endif /* #ifndef CONFIG_SPL_BUILD */
+#endif /* #ifndef CONFIG_XPL_BUILD */
 #endif /* #ifdef CONFIG_CHAIN_OF_TRUST */
 #endif