arm: socfpga: Change watchdog timeout

arm: socfpga: Change watchdog timeout

The current current watchdog timeout of 12 seconds is a bit small for
booting into Linux, especially when using a NFS based rootfs. So lets
change this timeout to a more defensive value of 30 seconds.

Also we now call the hw_watchdog_init() function so that we override
the value already configured from the Preloader.

Signed-off-by: Stefan Roese <[email protected]>
Cc: Vince Bridgers <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Chin Liang See <[email protected]>
Cc: Marek Vasut <[email protected]>
Cc: Pavel Machek <[email protected]>