watchdog: fix dependencies of menz69_wdt.o

Currently menz69_wdt.ko has a dependency on MCB or COMPILE_TEST. But
it actually needs symbols exported by MCB so the || COMPILE_TEST is
wrong.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>