Add voip(SIP related codes) into framework.

Change-Id: I12bbeb3dacd51b0234872529479e61bdd8536629
diff --git a/core/pathmap.mk b/core/pathmap.mk
index 70441b7..6cd3b8f 100644
--- a/core/pathmap.mk
+++ b/core/pathmap.mk
@@ -88,6 +88,7 @@
 	    wifi \
 	    vpn \
 	    keystore \
+	    voip \
 	 )
 
 #