spl: Create a function to init spl_load_info

Rather than having every caller set this up individually, create a
common init function. This allows new fields to be added without the
risk of them being left uninited.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
diff --git a/test/image/spl_load.c b/test/image/spl_load.c
index 7cbad40..3b62069 100644
--- a/test/image/spl_load.c
+++ b/test/image/spl_load.c
@@ -343,9 +343,7 @@
 	} else {
 		struct spl_load_info load;
 
-		spl_set_bl_len(&load, 1);
-		load.priv = img;
-		load.read = spl_test_read;
+		spl_load_init(&load, spl_test_read, img, 1);
 		if (type == IMX8)
 			ut_assertok(spl_load_imx_container(&info_read, &load,
 							   0));