Split the mem_desc code out from the MM code. This is to help
simplify the MM code and make it easier to abstract the DMA
allocation routines.
JIRA NVGPU-12
Change-Id: I2ccb643efe6bbed80d1360a580ff5593acb407bd
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/1323324
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>