pan/bi: Use 8-bit shifts

Logically, it doesn't matter, but we want the IR to accurately reflect
the hardware behaviour.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6749>
2 files changed