Update XML for new Explorer levels

Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
Change-Id: I2a79d0dc217241605cb798a3386d77b9aa59f33c
diff --git a/xml/explorer/chip_explorer.xml b/xml/explorer/chip_explorer.xml
index 8b46d74..df092fa 100644
--- a/xml/explorer/chip_explorer.xml
+++ b/xml/explorer/chip_explorer.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<chip name="Explorer" model_ec="EXPLORER_10">
+<chip name="Explorer" model_ec="EXPLORER_11,EXPLORER_20">
 
     <attn_tree attn_type="UCS" root_node="CHIPLET_OCMB_FIR"     node_inst="0" />
     <attn_tree attn_type="RE"  root_node="CHIPLET_OCMB_FIR"     node_inst="0" />