drm/i915/gt: Assert the kernel context is using the HWSP

We need to ensure that the kernel context is using the permanently pinned
HWSP so that we can always submit a pm request from any context. By
construction, the engine->kernel_context should only be using the
engine->status_page.vma so let's assert that is still true when we have
to submit a request for parking the engine.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200714114419.28713-1-chris@chris-wilson.co.uk

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