omni: add muli font and overlay

Change-Id: Ib4b179e3d61125a4b19fe3f7ad4872b97bd7350b
diff --git a/config/packages.mk b/config/packages.mk
index f9f171d..9d13fd1 100644
--- a/config/packages.mk
+++ b/config/packages.mk
@@ -76,3 +76,4 @@
     su
 
 $(call inherit-product-if-exists, external/google-fonts/lato/fonts.mk)
+$(call inherit-product-if-exists, vendor/omni/prebuilt/fonts/fonts.mk)