[WATCHDOG] watchdog_info constify

make the watchdog_info struct const where possible.

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/machzwd.c b/drivers/watchdog/machzwd.c
index 47d7197..2d118cf 100644
--- a/drivers/watchdog/machzwd.c
+++ b/drivers/watchdog/machzwd.c
@@ -101,7 +101,7 @@
 
 #define PFX "machzwd"
 
-static struct watchdog_info zf_info = {
+static const struct watchdog_info zf_info = {
 	.options		= WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
 	.firmware_version	= 1,
 	.identity		= "ZF-Logic watchdog",