global: Use CONFIG_XPL_BUILD instead of CONFIG_SPL_BUILD

Complete this rename for all directories outside arch/ board/ drivers/
and include/

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/test/Makefile b/test/Makefile
index ed312cd..f801d87 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -25,7 +25,7 @@
 obj-$(CONFIG_UT_TIME) += time_ut.o
 obj-y += ut.o
 
-ifeq ($(CONFIG_SPL_BUILD),)
+ifeq ($(CONFIG_XPL_BUILD),)
 obj-y += boot/
 obj-$(CONFIG_UNIT_TEST) += common/
 obj-y += log/