drm/vgem: fix cache synchronization on arm/arm64
drm_cflush_pages() is no-op on arm/arm64. But instead we can use dma_sync API. Fixes failures w/ vgem_test. Acked-by:Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by:
Rob Clark <robdclark@chromium.org> Signed-off-by:
Sean Paul <seanpaul@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20190717211542.30482-1-robdclark@gmail.com
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dc25ace6
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