panic: Introduce warn_limit

Like oops_limit, add warn_limit for limiting the number of warnings when
panic_on_warn is not set.

Cc: Jonathan Corbet <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Baolin Wang <[email protected]>
Cc: "Jason A. Donenfeld" <[email protected]>
Cc: Eric Biggers <[email protected]>
Cc: Huang Ying <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: tangmeng <[email protected]>
Cc: "Guilherme G. Piccoli" <[email protected]>
Cc: Tiezhu Yang <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: [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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