Update P10 chip data XML

Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
Change-Id: Ia864d6b7cb6bea6f245c0794687b0d32f2a3691c
diff --git a/xml/p10/chip_p10.xml b/xml/p10/chip_p10.xml
index f598f33..d019d34 100644
--- a/xml/p10/chip_p10.xml
+++ b/xml/p10/chip_p10.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<chip model_ec="P10_10" name="P10">
+<chip model_ec="P10_10,P10_20" name="P10">
     <attn_tree attn_type="CS" node_inst="0" root_node="GFIR_CS"/>
     <attn_tree attn_type="RE" node_inst="0" root_node="GFIR_RE"/>
     <attn_tree attn_type="SPA" node_inst="0" root_node="GFIR_SPA"/>