freedreno: Add dependency on the xml build to the winsys.
The screen header includes the common xml, and otherwise we might race to build before it's done.
Fixes: e0325997 ("freedreno: Generate headers from xml files")
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The screen header includes the common xml, and otherwise we might race to build before it's done.
Fixes: e0325997 ("freedreno: Generate headers from xml files")