gallium: Make util_copy_image_view handle shader_access

A while back, we added a new field, but failed to update the copier.
I believe iris is the only current user of the new field, and it hasn't
used the copier, so noone noticed.

Fixes: 8b626a22 st/mesa: Record shader access qualifiers for images
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
10 jobs for !1197 with gallium-copier-access in 7 minutes and 42 seconds (queued for 2 seconds)
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