vulkan: don't make small images unbacked when device memory runs out

When VRAM ran out, any image that failed to allocate became a sparse
image with nothing bound, which AMD's drivers don't survive being
sampled (an RX 6600 died mid-flood, an RX 7800 XT made 211 of them,
8x8 ones included). Try host memory first, and count the images that
didn't fit: the texture cache then keeps more room under the budget
(512 MiB a step, up to 3 GiB, decaying) so its collector runs earlier.
The sparse fallback stays for images too large to back.

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