texture_cache: collect images in the emptiest device memory blocks first

Deleting by age alone left every block partly used: the collector deletes
thousands of images a minute and new ones land in the holes, so blocks
seldom empty (title 1: ~0.8 GB of holes in ~190 32 MiB blocks after ten
minutes, counted by the driver as used). Among the oldest candidates, 8
per image a pass may delete, those in the emptiest blocks go first, so
blocks drain and VMA returns them; placement already prefers the fullest
blocks.

(cherry picked from commit 2f8f0716fafd874cfbb3cc9086141aea61aff2df)

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