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/lib/fdtdec.c b/lib/fdtdec.c
index 6276b27..b2d3879 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -1230,7 +1230,7 @@
 	if (IS_ENABLED(CONFIG_SANDBOX))
 		return NULL;
 
-#ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_XPL_BUILD
 	/* FDT is at end of BSS unless it is in a different memory region */
 	if (IS_ENABLED(CONFIG_SPL_SEPARATE_BSS))
 		fdt_blob = (ulong *)_image_binary_end;
@@ -1714,7 +1714,7 @@
 	}
 
 	/* Allow the early environment to override the fdt address */
-	if (!IS_ENABLED(CONFIG_SPL_BUILD)) {
+	if (!IS_ENABLED(CONFIG_XPL_BUILD)) {
 		ulong addr;
 
 		addr = env_get_hex("fdtcontroladdr", 0);