drm/i915: Emit a user level message when resetting the GPU (or engine)

Although a banned context will be told to -EIO off if they try to submit
more requests, we have a discrepancy between whole device resets and
per-engine resets where we report the GPU reset but not the engine
resets. This leaves a bit of mystery as to why the context was banned,
and also reduces awareness overall of when a GPU (engine) reset occurs
with its possible side-effects.

Signed-off-by: Chris Wilson <[email protected]>
Cc: Michel Thierry <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Reviewed-by: Michel Thierry <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Daniel Vetter <[email protected]>

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