UPSTREAM: dma-buf: set signaling bit for the stub fence

Here's setting software signaling bit for the stub fence
which is always signaled. If this fence signaling bit is
not set then the AMD GPU scheduler will cause a GPU reset
due to a GPU scheduler cleanup activity timeout.

Bug: 379008999
Change-Id: Ie48c708d40a6612085326be3a16de386fcafd175
Signed-off-by: Arvind Yadav <Arvind.Yadav@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220914164321.2156-3-Arvind.Yadav@amd.com


Signed-off-by: Christian König <christian.koenig@amd.com>
(cherry picked from commit c85d00d4)
Signed-off-by: T.J. Mercier <tjmercier@google.com>