panfrost: Implement framebuffer invalidation

panfrost: Implement framebuffer invalidation

The strategy is lifted from Freedreno. The trick is to remove buffers
from the resolve set, rather than add buffers to a discard set (as you
would naively try). The latter is wrong -- draws after the
glInvalidateFramebuffer() still need to be respected.

glmark2 -btexture on-screen with sway on Mali T860 from 1393fps to
1998fps

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Closes: #2407
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6295>