freedreno/a6xx: remove unnecessary OVERFLOW_FLAG_REG check

The HW deals with overflow automatically, and presumably does it better
(only disabling for pipes that had overflow, and using the visiblity data
available before the overflow)

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5565>
2 files changed