[WATCHDOG] timers cleanup

- Use timer macros to set function and data members and to modify
  expiration time.
- Use DEFINE_TIMER for single (platform dependent) watchdog timers and
  do not init them at run-time in these cases.
- del_timer_sync is common in most cases -- we want to wait for timer
  function if it's still running.

Signed-off-by: Jiri Slaby <[email protected]>
Cc: Steve Hill <[email protected]>
Cc: Heiko Ronsdorf <[email protected]>
Cc: Fernando Fuganti <[email protected]>
Cc: Gergely Madarasz <[email protected]>
Cc: Ken Hollis <[email protected]>
Cc: Paul Mundt <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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