Set BUILD_BROKEN_TREBLE_SYSPROP_NEVERALLOW

This temporariliy turns off treble sysprop neverallow rules which
enforces marking the owner and accessibility to each system property.

Bug: 131162102
Bug: 142684203
Test: m sepolicy_tests
Change-Id: I604479cc2ca1596b2c3a1fdca644d23b3156dd13
diff --git a/BoardConfig.mk b/BoardConfig.mk
index d39346e..c863cc8 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -59,3 +59,6 @@
 
 # Specify HALs
 DEVICE_MANIFEST_FILE := device/generic/trusty/manifest.xml
+
+# TODO(b/131162102): remove this after cleaning up accesses of sysprop
+BUILD_BROKEN_TREBLE_SYSPROP_NEVERALLOW := true