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radv: Fix acceleration structure size queries

Konstantin Seurer requested to merge KonstantinSeurer/mesa:radv-as-size-query-fix into main 
From looking at the CTS,
VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SIZE_KHR
refers to the serialization size and not to the
actual, current size.

Fixes the following CTS:
dEQP-VK.ray_tracing_pipeline.acceleration_structures.query_pool_results.cpu.buffer.size
dEQP-VK.ray_tracing_pipeline.acceleration_structures.query_pool_results.cpu.memory.size
dEQP-VK.ray_tracing_pipeline.acceleration_structures.query_pool_results.gpu.buffer.size
dEQP-VK.ray_tracing_pipeline.acceleration_structures.query_pool_results.gpu.memory.size

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