drm-uapi: Update i915_drm.h for I915_CONTEXT_PARAM_RECOVERABLE

Copying i915_drm.h from

commit ba4fda620a5f7db521aa9e0262cf49854c1b1d9c (HEAD -> drm-intel-next-queued, drm-intel/drm-intel-next-queued)
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Mon Feb 18 10:58:21 2019 +0000

    drm/i915: Optionally disable automatic recovery after a GPU reset

in order to expose the I915_CONTEXT_PARAM_RECOVERABLE for testing.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>