staging: comedi: ni_mio_common: init clock dividers early in ni_E_init()

The init/reset of the hardware is a bit scattered in this function. For
aesthetics, move the init of the clock dividers so it happens early and
tidy up the code a bit.

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>