gpu: nvgpu: fix per-GPU DMA allocation tracking

- total DMA memory allocation is currently tracked by adding page aligned
  size of nvgpu_mem
- The sequence is roughly as follows:
  - total dma memory used += mem->aligned_size
  - mem->aligned_size = PAGE_ALIGN(size)
- In above sequence, nvgpu_mem structure is initially zero when it is added
  to total dma memory used after which it is assigned page aligned value
- This patch fixes total dma memory usage tracking.

Change-Id: Ibb879c8d38ae9077c3d198d9bb008a72e9208b4d
Signed-off-by: Deepak Bhosale <dbhosale@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1685312
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

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