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/cmd_ut.c b/test/cmd_ut.c
index 38ba89e..53fddeb 100644
--- a/test/cmd_ut.c
+++ b/test/cmd_ut.c
@@ -256,7 +256,7 @@
 	"\ntime - very basic test of time functions"
 #endif
 #if defined(CONFIG_UT_UNICODE) && \
-	!defined(CONFIG_SPL_BUILD) && !defined(API_BUILD)
+	!defined(CONFIG_XPL_BUILD) && !defined(API_BUILD)
 	"\nunicode - Unicode functions"
 #endif
 	);