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panfrost: mark separate_stencil as valid when surface is valid

Eric Smith requested to merge ericsmith/mesa:ericsmith/panfrost-separate-stencil-fix into main 
panfrost: mark separate_stencil as valid when surface is valid

panfrost_initialize_surface is called when a surface is written to,
and marks that surface as valid. If the surface is a depth buffer
with a separate stencil, that separate stencil should also be marked
as valid; otherwise, readpixel will skip reading it (and hence the
stencil data will be read as uninitialized). This only affects
DEPTH32F_STENCIL8 formats.

Cc: mesa-stable
Signed-off-by: Eric R. Smith <eric.smith@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Edited by Eric Smith

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