security: Introduce inode_post_set_acl hook

In preparation for moving IMA and EVM to the LSM infrastructure, introduce
the inode_post_set_acl hook.

At inode_set_acl hook, EVM verifies the file's existing HMAC value. At
inode_post_set_acl, EVM re-calculates the file's HMAC based on the modified
POSIX ACL and other file metadata.

Other LSMs could similarly take some action after successful POSIX ACL
change.

The new hook cannot return an error and cannot cause the operation to be
reverted.

Signed-off-by: Roberto Sassu <[email protected]>
Reviewed-by: Stefan Berger <[email protected]>
Acked-by: Casey Schaufler <[email protected]>
Reviewed-by: Mimi Zohar <[email protected]>
Acked-by: Christian Brauner <[email protected]>
Signed-off-by: Paul Moore <[email protected]>

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