staging: comedi: addi_apci_1516: rename has_timer

The "timer" on these boards is actually a watchdog. Rename the
boardinfo value "has_timer" to "has_wdog".

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>