staging: tidspbridge - deprecate reserve/unreserve_memory funtions

Now what iommu memory usage is kept track by iommu module
the functions reserve/unreserve_memory are not needed anymore.

Signed-off-by: Fernando Guzman Lugo <x0095840@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>