drm/exynos: remove unused fields of struct exynos_drm_gem_buf
The userptr, write and pfnmap of struct exynos_drm_gem_buf are not used anywhere. Signed-off-by: NJoonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: NInki Dae <inki.dae@samsung.com>
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