Add BUILD_BROKEN_TREBLE_SYSPROP_NEVERALLOW

A new sysprop neverallow rules are mandatory only for devices launching
with R or later. For devices already launched, neverallow rules can be
relaxed with adding following line to BoardConfig.mk:

BUILD_BROKEN_TREBLE_SYSPROP_NEVERALLOW := true

Bug: 131162102
Test: Set PRODUCT_SHIPPING_API_LEVEL := 30 and try building with
changing some system_public_prop to system_internal_prop
Test: m cts sepolicy_tests

Change-Id: Id978b4d81a8683a57304bb639961105e2d91fa9a
Merged-In: Id978b4d81a8683a57304bb639961105e2d91fa9a
(cherry picked from commit 3be11e7abb8f4fd651295f9ccb0ce087855c1cc0)
4 files changed