Revert "winsys/radeon: if there's VRAM-only usage, keep it"
Revert "winsys/radeon: if there's VRAM-only usage, keep it"

This reverts commit 67aef6dafa29fed008ea6065c425a6a92a651be9.

It caused GPU hangs. The question is why.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75900

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