key: add tpm_send command

key: add tpm_send command

Add internal kernel tpm_send() command used to seal/unseal keys.

Changelog:
- replaced module_put in tpm_send() with new tpm_chip_put() wrapper
  (suggested by David Howells)
- Make tpm_send() cmd argument a 'void *' (suggested by David Howells)

Signed-off-by: David Safford <[email protected]>
Signed-off-by: Mimi Zohar <[email protected]>
Acked-by: David Howells <[email protected]>
Acked-by: Serge E. Hallyn <[email protected]>
Signed-off-by: James Morris <[email protected]>