drm/etnaviv: User FOLL_LONGTERM in userptr

There's no mmu notifier or anything like that, releasing this pin is
entirely up to userspace. Hence FOLL_LONGTERM.

No cc: stable for this patch since a lot of the infrastructure around
FOLL_LONGETRM (like not allowing it for pages currently sitting in
ZONE_MOVEABLE before they're migrated) is still being worked on. So
not big benefits yet.

Reviewed-by: John Hubbard <[email protected]>
Cc: John Hubbard <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Lucas Stach <[email protected]>
Cc: Russell King <[email protected]>
Cc: Christian Gmeiner <[email protected]>
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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