gpu: nvgpu: read GPC mask from h/w

In gk20a_ctrl_ioctl_gpu_characteristics() we right now just calculate
GPC mask in s/w and return to user space
But this could give incorrect result as any GPC could be floorswept
in h/w

Add gops.fuse.fuse_status_opt_gpc() to read GPC floorsweep status
from fuse
Add gops.gr.get_gpc_mask() to get actual GPC mask from h/w

Set these HALs only for dGPUs right now. Fuse register to read GPC
mask is not yet supported in simulation and hence simulation boot fails
These HALs will be set for iGPU once simulation issue is resolved

Use gops.gr.get_gpc_mask() if it is defined in
gk20a_ctrl_ioctl_gpu_characteristics() to send the actual GPC mask
to user space

Jira NVGPUT-132

Change-Id: I3b552de07883328fcfa41d4334ec0d777e04bdd3
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1822811
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

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