st/mesa: consolidate view format setup code

Before, we had code to compute the sampler view's format spread across two
different functions: in update_single_texture() and
st_get_texture_sampler_view_from_stobj().  Now it's all in one new function.

Also, use _mesa_texture_base_format() to simplify the code.

Reviewed-by: Edward O'Callaghan <[email protected]>
Reviewed-by: Nicolai Hähnle <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

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