spl: Remove filename from spl_load_info

For filesystems, filename serves the same purpose as priv. However,
spl_load_fit_image also uses it to determine whether to use a DMA-aligned
buffer. This is beneficial for FAT, which uses a bounce-buffer if the
destination is not DMA-aligned. However, this is unnecessary now that
filesystems set bl_len to ARCH_DMA_MINALIGN instead. With this done, we can
remove filename entirely.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/common/spl/spl_fat.c b/common/spl/spl_fat.c
index 5b72345..8a2c4e3 100644
--- a/common/spl/spl_fat.c
+++ b/common/spl/spl_fat.c
@@ -51,7 +51,7 @@
 {
 	loff_t actread;
 	int ret;
-	char *filename = (char *)load->filename;
+	char *filename = load->priv;
 
 	ret = fat_read_file(filename, buf, file_offset, size, &actread);
 	if (ret)
@@ -98,7 +98,7 @@
 		debug("Found FIT\n");
 		load.read = spl_fit_read;
 		load.bl_len = ARCH_DMA_MINALIGN;
-		load.filename = (void *)filename;
+		load.priv = (void *)filename;
 
 		return spl_load_simple_fit(spl_image, &load, 0, header);
 	} else {