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/hexdump.c b/lib/hexdump.c
index 2bc508f..29feccd 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -157,7 +157,7 @@
 			printf("%s%s\n", prefix_str, linebuf);
 			break;
 		}
-		if (!IS_ENABLED(CONFIG_SPL_BUILD) && ctrlc())
+		if (!IS_ENABLED(CONFIG_XPL_BUILD) && ctrlc())
 			return -EINTR;
 	}