cm: Remove root access prop

This property is already defaulted to 0 in the code.
The su_daemon is also disabled by default.

Thus, for all intents and purposes, root access is
already being disabled by default.

Change-Id: I1241689c0d3253aa2e44835c55839f24b3b74341
diff --git a/config/common.mk b/config/common.mk
index f82dbf2..d2f89ba 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -234,9 +234,6 @@
     su
 endif
 
-PRODUCT_PROPERTY_OVERRIDES += \
-    persist.sys.root_access=0
-
 DEVICE_PACKAGE_OVERLAYS += vendor/cm/overlay/common
 
 PRODUCT_VERSION_MAJOR = 14