watchdog: constify watchdog_ops and watchdog_info structures

These watchdog_ops and watchdog_info structures are only stored
in the ops and info fields of a watchdog_device structure,
respectively, which are const. Thus make the watchdog_ops and
watchdog_info structures const as well.

Done with the help of Coccinelle. The rules for the watchdog_ops case are
as follows:

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct watchdog_ops i@p = { ... };

@ok@
identifier r.i;
struct watchdog_device e;
position p;
@@
e.ops = &i@p;

@bad@
position p != {r.p,ok.p};
identifier r.i;
struct watchdog_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
struct watchdog_ops i = { ... };
// </smpl>

Signed-off-by: Julia Lawall <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/diag288_wdt.c

···
 	.set_timeout = wdt_set_timeout,
 };
 
-static struct watchdog_info wdt_info = {
+static const struct watchdog_info wdt_info = {
 	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
 	.firmware_version = 0,
 	.identity = "z Watchdog",

drivers/watchdog/mt7621_wdt.c

···
 	return 0;
 }
 
-static struct watchdog_info mt7621_wdt_info = {
+static const struct watchdog_info mt7621_wdt_info = {
 	.identity = "Mediatek Watchdog",
 	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
 };

drivers/watchdog/rt2880_wdt.c

···
 	return 0;
 }
 
-static struct watchdog_info rt288x_wdt_info = {
+static const struct watchdog_info rt288x_wdt_info = {
 	.identity = "Ralink Watchdog",
 	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
 };