drm/lima: use drm_gem_shmem_helpers
Do not need to maintain our own shmem memory management code as drm_gem_shmem_helpers provides it. And we can also benifit from the work of others with shared code. This is also a preparation for implementing buffer madv. Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com> Signed-off-by: Qiang Yu <yuq825@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191010140152.17747-2-yuq825@gmail.com
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