staging: comedi: dmm32at: rename DMM32AT_FIFOCNTRL

For aesthetics, rename this define used for the FIFO Control register.
Also, rename the defines used for the bits of this register.

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>