drm/vmwgfx: Replace iowrite/ioread with volatile memory accesses
Now that we use memremap instead of ioremap, Use WRITE_ONCE / READ_ONCE instead of iowrite / ioread. Signed-off-by: NThomas Hellstrom <thellstrom@vmware.com> Reviewed-by: NSinclair Yeh <syeh@vmware.com>
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