dfu: export dfu_list

This variable will be utilized to enumerate all dfu entities
for UEFI capsule firmware update in a later commit.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
index a298c2c..501a60b 100644
--- a/drivers/dfu/dfu.c
+++ b/drivers/dfu/dfu.c
@@ -18,7 +18,7 @@
 #include <linux/list.h>
 #include <linux/compiler.h>
 
-static LIST_HEAD(dfu_list);
+LIST_HEAD(dfu_list);
 static int dfu_alt_num;
 static int alt_num_cnt;
 static struct hash_algo *dfu_hash_algo;