arm64: defconfig: Disable CONFIG_CFI_PERMISSIVE flag

Convert all CFI warnings to errors. This puts CFI in enforcing mode.
ALL CFI errors will now end up crashing the device.

Change-Id: Id913da6ed79dd0258f5989c7787b860ce7c4892a
Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>