drm/xe: Add devcoredump chunking

Chunk devcoredump into 1.5G pieces to avoid hitting the kvmalloc limit
of 2G. Simple algorithm reads 1.5G at time in xe_devcoredump_read
callback as needed.

Some memory allocations are changed to GFP_ATOMIC as they done in
xe_devcoredump_read which holds lock in the path of reclaim. The
allocations are small, so in practice should never fail.

v2:
 - Update commit message wrt gfp atomic (John H)
v6:
 - Drop GFP_ATOMIC change for hwconfig (John H)

Signed-off-by: Matthew Brost <[email protected]>
Reviewed-by: Jonathan Cavitt <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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