watchdog: Move watchdog_dev to data section (BSS may not be cleared)

watchdog: Move watchdog_dev to data section (BSS may not be cleared)

This patch moves all instances of static "watchdog_dev" declarations to
the "data" section. This may be needed, as the BSS may not be cleared
in the early U-Boot phase, where watchdog_reset() is already beeing
called. This may result in incorrect pointer access, as the check to
"!watchdog_dev" in watchdog_reset() may not be true and the function
may continue to run.

Signed-off-by: Stefan Roese <[email protected]>
Cc: Heiko Schocher <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: "Marek Behún" <[email protected]>
Cc: Daniel Schwierzeck <[email protected]>
Tested-by: Michal Simek <[email protected]> (on zcu100)
Reviewed-by: Michal Simek <[email protected]>