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/env/sf.c b/env/sf.c
index 21ac0c2..eb4c8d5 100644
--- a/env/sf.c
+++ b/env/sf.c
@@ -329,7 +329,7 @@
 
 __weak void *env_sf_get_env_addr(void)
 {
-#ifndef CONFIG_SPL_BUILD
+#ifndef CONFIG_XPL_BUILD
 	return (void *)CONFIG_ENV_ADDR;
 #else
 	return NULL;