bpf: Add config to allow loading modules with BTF mismatches

BTF mismatch can occur for a separately-built module even when the ABI is
otherwise compatible and nothing else would prevent successfully loading.

Add a new Kconfig to control how mismatches are handled. By default, preserve
the current behavior of refusing to load the module. If MODULE_ALLOW_BTF_MISMATCH
is enabled, load the module but ignore its BTF information.

Suggested-by: Yonghong Song <[email protected]>
Suggested-by: Michal Suchánek <[email protected]>
Signed-off-by: Connor O'Brien <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Shung-Hsi Yu <[email protected]>
Acked-by: Song Liu <[email protected]>
Link: https://lore.kernel.org/bpf/CAADnVQJ+OVPnBz8z3vNu8gKXX42jCUqfuvhWAyCQDu8N_yqqwQ@mail.gmail.com
Link: https://lore.kernel.org/bpf/[email protected]

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