vendor: add prebuilt vi editor

Change-Id: Ib32ce25f5da06615fea681250b807934b8c91cf2
diff --git a/config/packages.mk b/config/packages.mk
index 432143b..617575c 100644
--- a/config/packages.mk
+++ b/config/packages.mk
@@ -33,6 +33,8 @@
     toybox_vendor \
     sh_vendor
 
+PRODUCT_COPY_FILES += \
+    vendor/omni/prebuilt/bin/vi:system/bin/vi
 
 # Telephony extension
 PRODUCT_PACKAGES += telephony-ext