Handle gv11b specific of gpu: nvgpu: Move DMA API to dma.h In the main nvgpu repository. JIRA NVGPU-12 Change-Id: I9645c4eedc5f61585d15caeee54db92bc4cca079 Signed-off-by: Alex Waterman <alexw@nvidia.com> Reviewed-on: http://git-master/r/1455212 Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com> Reviewed-by: Konsta Holtta <kholtta@nvidia.com> Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com> GVS: Gerrit_Virtual_Submit