lsm: count the LSMs enabled at compile time

These macros are a clever trick to determine a count of the number of
LSMs that are enabled in the config to ascertain the maximum number of
static calls

lsm: count the LSMs enabled at compile time

These macros are a clever trick to determine a count of the number of
LSMs that are enabled in the config to ascertain the maximum number of
static calls that need to be configured per LSM hook.

Without this one would need to generate static calls for the total
number of LSMs in the kernel (even if they are not compiled) times the
number of LSM hooks which ends up being quite wasteful.

Tested-by: Guenter Roeck <[email protected]>
Suggested-by: Kui-Feng Lee <[email protected]>
Suggested-by: Andrii Nakryiko <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Casey Schaufler <[email protected]>
Reviewed-by: John Johansen <[email protected]>
Acked-by: Casey Schaufler <[email protected]>
Acked-by: Song Liu <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Nacked-by: Tetsuo Handa <[email protected]>
Signed-off-by: KP Singh <[email protected]>
[PM: added IPE to the count during merge]
Signed-off-by: Paul Moore <[email protected]>

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