vendor: add su and bash for eng builds

Change-Id: I425b87f3a57392c2bbc6f25b9e0f7b40126db612
diff --git a/config/packages.mk b/config/packages.mk
index 1e0d29e..6eb6495 100644
--- a/config/packages.mk
+++ b/config/packages.mk
@@ -120,3 +120,7 @@
 
 #PRODUCT_PACKAGES += \
     ExtraFonts
+
+PRODUCT_PACKAGES_ENG += \
+    bash \
+    su