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tu/a7xx: Fix occlusion queries on pre-A740 GPUs

What does this MR do and why?

CP_EVENT_WRITE7::WRITE_SAMPLE_COUNT is supported only starting from a740, previous GPUs use RB_SAMPLE_COUNT_ADDR.

See: https://github.com/yuzu-emu/yuzu/issues/11958

WIP because I need a confirmation that it works.

Edited by Danylo Piliaiev

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