staging: nvec: remove include of <mach/iomap.h>

Nothing from this file is used, and the file will hopefully be deleted
soon.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-By: Marc Dietrich <marvin24@gmx.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>