freedreno: Fix CP_MEM_TO_REG flag definitions
These actually mean something completely different, at least on A5xx
and A6xx. The only other usage of the old flags on something older than
A6xx was a typo, so I don't know if it was always this way, but at the
same time it means that we don't have to worry too much about that.
Reviewed-by: Eric Anholt <eric@anholt.net>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3116>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3116>