exit: Expose "oops_count" to sysfs

Since Oops count is now tracked and is a fairly interesting signal, add
the entry /sys/kernel/oops_count to expose it to userspace.

Cc: "Eric W. Biederman" <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Reviewed-by: Luis Chamberlain <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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