drm/i915/selftests: ensure we reserve a fence slot

We should always be explicit and allocate a fence slot before adding a
new fence.

Signed-off-by: Matthew Auld <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Lionel Landwerlin <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Jon Bloomfield <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Jordan Justen <[email protected]>
Cc: Kenneth Graunke <[email protected]>
Cc: Akeem G Abodunrin <[email protected]>
Reviewed-by: Thomas Hellström <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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