vfio/nvgrace-gpu: Inform devmem unmapped after reset

Introduce a new flag reset_done to notify that the GPU has just
been reset and the mapping to the GPU memory is zapped.

Implement the reset_done handler to set this new variable. It
will be used later in the patches to wait for the GPU memory
to be ready before doing any mapping or access.

Cc: Jason Gunthorpe <jgg@ziepe.ca>
Reviewed-by: Shameer Kolothum <skolothumtho@nvidia.com>
Suggested-by: Alex Williamson <alex@shazbot.org>
Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
Link: https://lore.kernel.org/r/20251127170632.3477-6-ankita@nvidia.com
Signed-off-by: Alex Williamson <alex@shazbot.org>

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