st/va: reverse qt matrix back to its original order

The quantiser matrix that VAAPI provides has been applied with inverse z-scan.
However, what we expect in MPEG2 picture description is the original order.
Therefore, we need to reverse it back to its original order.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110257


Cc: mesa-stable@lists.freedesktop.org

Signed-off-by: Boyuan Zhang <boyuan.zhang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit d507bcdc)