[WATCHDOG] sbc60xxwdt.c patch

general cleanup of trailing spaces and comments
fix possible wdt_is_open race
add KERN_* to printk's
changed watchdog_info to correctly reflect what the driver offers
added WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS, WDIOC_SETTIMEOUT, WDIOC_GETTIMEOUT, and WDIOC_SETOPTIONS ioctls
made timeout (the emulated heartbeat) a module_param
made the keepalive ping an internal subroutine
added MODULE_AUTHOR and MODULE_DESCRIPTION info