The bcm_kona_wdt_set_resolution_reg() call takes the spinlock, so
initialize it earlier.  Fixes a warning at boot with lock debugging
enabled.

Fixes: 6adb730d ("watchdog: bcm281xx: Watchdog Driver")
Signed-off-by: NEric Anholt <eric@anholt.net>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>