drm/i915: Only allocate preempt context when required

If we remove some hardcoded assumptions about the preempt context having
a fixed id, reserved from use by normal user contexts, we may only
allocate the i915_gem_context when required. Then the subsequent
decisions on using preemption reduce to having the preempt context
available.

v2: Include an assert that we don't allocate the preempt context twice.

Signed-off-by: Chris Wilson <[email protected]>
Cc: Michal Winiarski <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Arkadiusz Hiler <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Acked-by: Daniele Ceraolo Spurio <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Michel Thierry <[email protected]>

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