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Add a unit test to cover the pd_cache unit. This unit is responsible for maintaining the page directory allocations. It's effectively a DMA slab allocator since we want to be able to pack multiple sub page sized page directories into a single page. JIRA NVGPU-1323 Change-Id: If65a803cf2ee5af9938668958b9353d50b2e98f9 Signed-off-by: Alex Waterman <alexw@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1942248 GVS: Gerrit_Virtual_Submit Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>