CHROMIUM: rk3288-vpu: Set DMA_ATTR_ALLOC_SINGLE_PAGES

CHROMIUM: rk3288-vpu: Set DMA_ATTR_ALLOC_SINGLE_PAGES

We do video allocation all the time and we need it to be fast.  Plus TLB
efficiency isn't terribly important for video.

That means we want to set DMA_ATTR_ALLOC_SINGLE_PAGES

See also the previous change ("ARM: dma-mapping: Use
DMA_ATTR_ALLOC_SINGLE_PAGES hint to optimize alloc")

BUG=chromium:570532
TEST=Memory pressure + cat videos is even smoother!

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/322336
Reviewed-by: Dmitry Torokhov <dtor@chromium.org>
Change-Id: I8bda3d9655daaa893c7bead7108b863607d1614f
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>