panfrost: Correctly identify format 0x4c

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4292>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4292>
3 files changed