drm/i915/gem: Make i915_gem_shrinker multi-gt aware

Where applicable, use for_each_gt instead of to_gt in the
i915_gem_shrinker functions to make them apply to more than just the
primary GT.  Specifically, this ensure i915_gem_shrink_all retires all
requests across all GTs, and this makes i915_gem_shrinker_vmap unmap
VMAs from all GTs.

v2: Pass correct GT to intel_gt_retire_requests(Andrzej).
v3: Remove unnecessary braces(Andi)
v4: Undo v3 to fix build failure.

Signed-off-by: Jonathan Cavitt <[email protected]>
Signed-off-by: Nirmoy Das <[email protected]>
Reviewed-by: Andrzej Hajda <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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