drm/vmwgfx: Unmap the surface before resetting it on a plane state

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SUSE CVE-2023-52648

In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: Unmap the surface before resetting it on a plane state Switch to a new plane state requires unreferencing of all held surfaces. In the work required for mob cursors the mapped surfaces started being cached but the...