drm/i915/gem: Flush lmem contents after construction

i915_gem_object_create_lmem_from_data() lacks the flush of the data
written to lmem to ensure the object is marked as dirty and the writes
flushed to the backing store. Once created, we can immediately release
the obj->mm.mapping caching of the vmap.

Fixes: 7acbbc7cf485 ("drm/i915/guc: put all guc objects in lmem when available")
Cc: Matthew Auld <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: Andi Shyti <[email protected]>
Cc: Matthew Brost <[email protected]>
Cc: John Harrison <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Cc: <[email protected]> # v5.16+
Signed-off-by: Nirmoy Das <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Reviewed-by: Nirmoy Das <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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