drivers: Use CONFIG_XPL_BUILD instead of CONFIG_SPL_BUILD

Use the new symbol to refer to any 'SPL' build, including TPL and VPL

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/sysreset/sysreset_ast.c

@@ -33,7 +33,7 @@ static int ast_sysreset_request(struct udevice *dev, enum sysreset_t type)
 		return -EPROTONOSUPPORT;
 	}
 
-#if !defined(CONFIG_SPL_BUILD)
+#if !defined(CONFIG_XPL_BUILD)
 	ret = wdt_expire_now(wdt, reset_mode);
 	if (ret) {
 		debug("Sysreset failed: %d", ret);