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iris: let isl set tiling mode for external resources

Tapani Pälli requested to merge tpalli/mesa:memobj_isl_tiling into main 
Patch sets memory object external format (which is otherwise
PIPE_FORMAT_NONE for memory objects) before main surface gets
configured. With this we can add a check that when dealing
with external resource that has no modifier set, we let isl
figure out the tiling mode.

Fixes memobj tests on DG2:
   piglit.spec.ext_external_objects.vk-image-display-muliple-textures
   piglit.spec.ext_external_objects.vk-image-display-overwrite
   piglit.spec.ext_external_objects.vk-depth-display
   piglit.spec.ext_external_objects.vk-image-display
   piglit.spec.ext_external_objects.vk-stencil-display

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/7684
Cc: mesa-stable
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Edited by Tapani Pälli

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