Add 'bios' and 'misc' inventory items

Add these because even though they don't represent
physical items, other code currently needs them to
store information in.

Resolves openbmc/openbmc#594.

Change-Id: I45ce980f12fa6e859bdd0800702f7adaadda80c8
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/inventory.pl b/inventory.pl
index 83d7766..13c3df1 100755
--- a/inventory.pl
+++ b/inventory.pl
@@ -75,6 +75,15 @@
 
 }
 
+#Hardcode the entries that will never be in the MRW
+#TODO: openbmc/openbmc#596 Remove when BIOS version is stored elsewhere.
+$inventory{'<inventory_root>/system/bios'} =
+    {is_fru => 1, fru_type => 'SYSTEM'};
+
+#TODO: openbmc/openbmc#597 Remove when misc FRU data is stored elsewhere.
+$inventory{'<inventory_root>/system/misc'} =
+    {is_fru => 0, fru_type => 'SYSTEM'};
+
 transform(\@items, \%inventory);
 
 #Encode in JSON and write it out