staging: nvec: Add a udelay(100) to nvec_interrupt

As the comment indicates, adding that udelay seems to
improve the stability of the communication, although
it is not known why this is the case.

Signed-off-by: Julian Andres Klode <jak@jak-linux.org>
Acked-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>