d3d12: Fix AV1 video encode 32 bits build
What does this MR do and why?
Cherry-picks a commit to fix a compilation failure.
d3d12: Fix AV1 video encode 32 bits build
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26573>
(cherry picked from commit 096e17b57832e96e36fc27f70e7a0e5ccbb0ac8a)