treewide: Switch DEFINE_TIMER callbacks to struct timer_list *

This changes all DEFINE_TIMER() callbacks to use a struct timer_list
pointer instead of unsigned long. Since the data argument has already been
removed, none of these callbacks are using their argument currently, so
this renames the argument to "unused".

Done using the following semantic patch:

@match_define_timer@
declarer name DEFINE_TIMER;
identifier _timer, _callback;
@@

 DEFINE_TIMER(_timer, _callback);

@change_callback depends on match_define_timer@
identifier match_define_timer._callback;
type _origtype;
identifier _origarg;
@@

 void
-_callback(_origtype _origarg)
+_callback(struct timer_list *unused)
 { ... }

Signed-off-by: Kees Cook <keescook@chromium.org>

drivers/char/nwbutton.c

@@ -23,7 +23,7 @@
 #define __NWBUTTON_C		/* Tell the header file who we are */
 #include "nwbutton.h"
 
-static void button_sequence_finished (unsigned long parameters);
+static void button_sequence_finished(struct timer_list *unused);
 
 static int button_press_count;		/* The count of button presses */
 /* Times for the end of a sequence */
@@ -127,7 +127,7 @@ static void button_consume_callbacks (int bpcount)
  * any matching registered function callbacks, initiate reboot, etc.).
  */
 
-static void button_sequence_finished (unsigned long parameters)
+static void button_sequence_finished(struct timer_list *unused)
 {
 	if (IS_ENABLED(CONFIG_NWBUTTON_REBOOT) &&
 	    button_press_count == reboot_count)