MLBEDSW-4644 Removed unnecessary LUT DMA commands

Fixed a bug where a DMA command for the activation LUT would be issued
for every depth-slice of an operator. This caused multiple
unnecessary DMA commands.

Signed-off-by: Jacob Bohlin <jacob.bohlin@arm.com>
Change-Id: I9c291692d8002f05656bb88214836ab389a56cdb