microblaze: Do not setup empty unmap_sg function
No reason to setup empty function. Core is checking
if this function should be called or not.
Signed-off-by: 
Michal Simek <michal.simek@xilinx.com>
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No reason to setup empty function. Core is checking
if this function should be called or not.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>