Change the global CFI flag to default to enabled.

This CL changes the ENABLE_CFI flag to default to enabled. Setting it
to false will override local settings to enable CFI.

Bug: 30227045
Bug: 22033465
Test: m -j40 works and device boots
Test: cfi is honored unless the global flag is set.
Change-Id: I1e449f5a4c56a76865ebe5bb8613e3781fbbac14
1 file changed