Remove Superuser app

superuser access doesn't require an app now, it's been tied to
privacy guard

Change-Id: I592a2a7d36e3e6710885161a610e13c7e835ae67
diff --git a/config/common.mk b/config/common.mk
index b1a6a82..f710efd 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -206,7 +206,6 @@
 PRODUCT_PACKAGES += \
     procmem \
     procrank \
-    Superuser \
     su
 endif