buffer_cache: collect on the buffers' own size for Switch 2 titles

The buffer collector compared the whole device's memory use with thresholds from the
device size, so with title 1's textures filling an 8 GB GPU (~6.8 GB used, buffers ~200
MiB of it) it ran aggressively every frame: up to 64 buffers evicted and recreated later,
the GPU-written ones downloaded first with a wait for the GPU (~5% of the GPU thread).
For Switch 2 titles it now runs when the buffers themselves pass 1 GiB (aggressive past
2 GiB); below the aggressive mode it also keeps buffers holding GPU-written data, which
it would have to download. Other titles keep the device-wide thresholds. Buffer
downloads by the collector: 5.4% -> 0%; the cache settles around 540 MiB.

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