dfu: cosmetic: cleanup sf to avoid checkpatch error

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Lukasz Majewski <lukma@denx.de>
diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
index d2b67b1..e9db7f8 100644
--- a/drivers/dfu/dfu.c
+++ b/drivers/dfu/dfu.c
@@ -478,14 +478,15 @@
 
 const char *dfu_get_dev_type(enum dfu_device_type t)
 {
-	const char *dev_t[] = {NULL, "eMMC", "OneNAND", "NAND", "RAM", "SF" };
+	const char *const dev_t[] = {NULL, "eMMC", "OneNAND", "NAND", "RAM",
+				     "SF"};
 	return dev_t[t];
 }
 
 const char *dfu_get_layout(enum dfu_layout l)
 {
-	const char *dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2",
-					   "EXT3", "EXT4", "RAM_ADDR" };
+	const char *const dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2",
+					  "EXT3", "EXT4", "RAM_ADDR" };
 	return dfu_layout[l];
 }