staging: comedi: dmm32at: rename DMM32AT_INTCLOCK

For aesthetics, rename this define used for the Interrupt and A/D Clock Control
and Status register. Also, rename the defines for the bits of the 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>