gpu: nvgpu: move snapshot_client memory handling to linux

We right now store dmabuf fd and dma_buf pointer for gk20a_cs_snapshot_client
But since dma_buf and all related APIs are linux specific, we need to remove
them from common code and move them to linux specific code

Add new linux specific structure gk20a_cs_snapshot_client_linux which includes
struct gk20a_cs_snapshot_client and linux specific dma_buf pointer

In gk20a_attach_cycle_stats_snapshot(), we first handle all dma_buf related
operations and then call gr_gk20a_css_attach()

Move gk20a_channel_free_cycle_stats_snapshot() to ioctl_channel.c
In gk20a_channel_free_cycle_stats_snapshot(), we call gr_gk20a_css_detach()
and then free up dma_buf in linux specific code

We also need to call gk20a_channel_free_cycle_stats_snapshot() while closing
the channel, so call it from linux specific nvgpu_channel_close_linux()

Jira NVGPU-397
Jira NVGPU-415

Change-Id: Ida27240541f6adf31f28d7d7ee4f51651c6d3de2
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1603908
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>

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