winsys/radeon: move managing GEM domains back to drivers

This partially reverts commit 363ff844753c46ac9c13866627e096b091ea81f8.

It caused severe performance drops in Nexuiz. Reported by Phoronix.

Tested by me on r300g and by IRC people on r600g.
diff --git a/src/gallium/drivers/r600/r600_hw_context_priv.h b/src/gallium/drivers/r600/r600_hw_context_priv.h
index 206de7e..2ad5624 100644
--- a/src/gallium/drivers/r600/r600_hw_context_priv.h
+++ b/src/gallium/drivers/r600/r600_hw_context_priv.h
@@ -90,7 +90,7 @@
 
 	assert(usage);
 
-	reloc_index = ctx->ws->cs_add_reloc(ctx->cs, rbo->cs_buf, usage);
+	reloc_index = ctx->ws->cs_add_reloc(ctx->cs, rbo->cs_buf, usage, rbo->domains);
 	if (reloc_index >= ctx->creloc)
 		ctx->creloc = reloc_index+1;