drivers: 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/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 628be4c..7c19a43 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -3,7 +3,7 @@
 # (C) Copyright 2000-2007
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 obj-$(CONFIG_SCSI) += scsi.o scsi-uclass.o
 ifdef CONFIG_SCSI
 obj-$(CONFIG_$(SPL_TPL_)BOOTSTD) += scsi_bootdev.o
@@ -12,7 +12,7 @@
 endif
 endif
 
-ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_XPL_BUILD
 ifdef CONFIG_SPL_SATA
 obj-$(CONFIG_SCSI) += scsi.o scsi-uclass.o
 endif