v3dv/pipeline: use derefs for ubo/ssbo
There are some potential advantages for that. Even if we are not
taking advantage of them, it would be interesting to be using this
path now, specially as non-deref path could be removed at some point.
Note that instead of returning for both resource_index and
vulkan_descriptor a vec2, we return a scalar for the first one, as it
is what the v3d backend expect (like for get_ssbo_size). For this to
work, we reconfigure the vec2 at vulkan_descriptor using the index and
an unused 0 value.
As far as I see turnip avoids that by lowering too load_ssbo/ubo, so
it just gets the index lowered (that in their case it is a vec3 with a
fixed 0 on the third component), but for now it is easier doing this.
v2: return a single-component for the index, to avoid the backend
needing to handle it (Eric, Jason).
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>
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