asahi: Refactor PBE upload routine

asahi: Refactor PBE upload routine

In general, PBE descriptors map pipe_image_views for the hardware. That we use a
writeable shader image internally for render targets is an implementation-detail
of the end-of-tile program. So, refactor the PBE upload routine to take a
pipe_image_view (not a pipe_surface), and translate the pipe_surface into an
internal pipe_image_view for end-of-tile programs.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24258>