staging: comedi: ni_65xx: fix ni_65xx_intr_insn_config()

Refactor this function to follow the standard (*insn_config) form.

Add a sanity check of the number of data parameters (insn->n). Currently
the core does not check INSN_CONFIG_CHANGE_NOTIFY.

Fix the writes to the rise/fall edge enable registers. The macro expects
a "port" value not the port offset value.

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>