meta-phosphor: prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I588025b614416c43aa2d053765ab53bacf890cb5
diff --git a/meta-phosphor/classes/obmc-phosphor-utils.bbclass b/meta-phosphor/classes/obmc-phosphor-utils.bbclass
index a8f7175..b0f1faf 100644
--- a/meta-phosphor/classes/obmc-phosphor-utils.bbclass
+++ b/meta-phosphor/classes/obmc-phosphor-utils.bbclass
@@ -1,4 +1,4 @@
-def set_append(d, var, val, sep=' '):
+def set_doappend(d, var, val, sep=' '):
     values = (d.getVar(var, True) or '').split(sep)
     if filter(bool, values):
         d.appendVar(var, '%s%s' %(sep, val))