[WATCHDOG] NS pc87413-wdt Watchdog driver v1.1

Change the driver for proper spin_locking,
remove the TEMP_MINOR stuff,
make sure the device works as a Virtual File System
that is non_seekable,
...
Signed-off-by: NSven Anders <anders@anduras.de>
Signed-off-by: NMarcus Junker <junker@anduras.de>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>