kfence: add kfence.fault parameter

kfence: add kfence.fault parameter

Add kfence.fault parameter to control the behavior when a KFENCE error is
detected (similar in spirit to kasan.fault=<mode>).

The supported modes for kfence.fault=<mode> are:

  - report: print the error report and continue (default).
  - oops: print the error report and oops.
  - panic: print the error report and panic.

In particular, the 'oops' mode offers a trade-off between no mitigation
on report and panicking outright (if panic_on_oops is not set).

Link: https://lkml.kernel.org/r/20260225203639.3159463-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <kees@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>