Make symlinks for DroidSans.ttf and DroidSans-Bold.ttf

Bug: 5420351

Make the following symlinks:
/system/fonts/DroidSans.ttf -> Roboto-Regular.ttf
/system/fonts/DroidSans-Bold.ttf -> Roboto-Bold.ttf

Change-Id: If9a74ef4ac2386cdb46d125fed8ce5771e872310
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 1c85279..9381437 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -115,6 +115,7 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/media/audio/)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/fonts/DroidSans*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/media/audio/)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/fonts/DroidSans*)
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************