HACK: arm64: add fuzzing config fragments

This is commited to aid future reproducibility of bugs found on this
branch, and is not intended for upstream.

Build with:

$ make defconfig fuzzing.config
$ make

Or:

$ make defconfig fuzzing.config kasan.config
$ make

Or:

$ make defconfig fuzzing.config kcsan.config
$ make

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
3 files changed