staging: comedi: ni_labpc_common: use comedi_timeout() when writing to eeprom

Use the comedi_timeout() helper to wait for the eeprom to be ready to accept
writes and remove the timeout loop in labpc_eeprom_write().

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