zink: more accurately check samplecount caps for shader images
lavapipe can only do up to 4bits, so this isn't just a binary check
Fixes: 0daa6155 ("zink: check if multisample support exists for shader image formats")
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lavapipe can only do up to 4bits, so this isn't just a binary check
Fixes: 0daa6155 ("zink: check if multisample support exists for shader image formats")