Add new rs directory to list of Java subdirs of fw/base.

Change-Id: I3213a314e7700162e781526c0450678495442759
diff --git a/core/pathmap.mk b/core/pathmap.mk
index feecfbf..28661c2 100644
--- a/core/pathmap.mk
+++ b/core/pathmap.mk
@@ -89,6 +89,7 @@
 	    telephony \
 	    wifi \
 	    keystore \
+	    rs \
 	 )
 
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