FROMGIT: dma_buf: remove dmabuf sysfs teardown before release

Dmabuf sysfs stat is used for dmabuf info track.
But these file maybe still in use after buffer released,
should clear it before buffer release.

Signed-off-by: Guangming Cao <Guangming.Cao@mediatek.com>

Bug: 193585160
(cherry picked from commit 63c57e8d
 https://anongit.freedesktop.org/git/drm/drm-misc.git drm-misc)
Link: https://patchwork.freedesktop.org/patch/445008/


Change-Id: I0715d265f1c363130bd6cf4c036a5fd3730e2b16
Signed-off-by: Guangming Cao <Guangming.Cao@mediatek.com>