mesa/st: fix up several uses of pipe_map_buffer_range
This function used to return a pointer to where the start of the actual buffer would have been, even though only the requested range is being mapped. In the resources change, the function was modified to use a transfer internally, and started returning the pointer to the beginning of the transfer, ie the mapped range. Some users of the function were changed to reflect this new behaviour, some were not. Since then the function has reverted to its original behaviour, matching master. This change restores some of the users of the map_buffer_range helper to expect the old/original behaviour.
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