omni: add lato font overlay

add file fonts_customization.xml to allow using
fonts in /product/fonts

Change-Id: Icee8715f9960ac7b27daeebb393d4b28b1848df6
diff --git a/themes/overlays/Android.mk b/themes/overlays/Android.mk
index 4c9f0d4..80da163 100644
--- a/themes/overlays/Android.mk
+++ b/themes/overlays/Android.mk
@@ -24,7 +24,8 @@
 	PrimaryColorOmniBlackOverlay \
 	PrimaryColorDarkBlueOverlay \
 	PrimaryColorDeepBlueOverlay \
-	AccentColorRedDevilOverlay
+	AccentColorRedDevilOverlay \
+	FontLatoSourceOverlay
 
 include $(BUILD_PHONY_PACKAGE)
 include $(CLEAR_VARS)