drm/i915: move gem_context slab to direct module init/exit

With the global kmem_cache shrink infrastructure gone there's nothing
special and we can convert them over.

I'm doing this split up into each patch because there's quite a bit of
noise with removing the static global.slab_luts to just a
slab_luts.

v2: Make slab static (Jason, 0day)

Reviewed-by: Jason Ekstrand <[email protected]>
Cc: Jason Ekstrand <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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