drm/i915: Wrap i915_active in a simple kreffed struct

For conveniences of callers that just want to use an i915_active to
track a wide array of concurrent timelines, wrap the base i915_active
struct inside a kref. This i915_active will self-destruct after use.

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

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