TPM: revert the list handling logic fixed in 398a1e71

commit b1a4144a upstream.

Mimi reported that afb5abc2 reverts the fix in 398a1e71. This patch
reverts it back.

Fixes: afb5abc2 ("tpm: two-phase chip management functions")
Reported-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: Peter Huewe <PeterHuewe@gmx.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

drivers/char/tpm/tpm-chip.c

@@ -231,7 +231,7 @@ int tpm_chip_register(struct tpm_chip *chip)
 
 	/* Make the chip available. */
 	spin_lock(&driver_lock);
-	list_add_rcu(&chip->list, &tpm_chip_list);
+	list_add_tail_rcu(&chip->list, &tpm_chip_list);
 	spin_unlock(&driver_lock);
 
 	chip->flags |= TPM_CHIP_FLAG_REGISTERED;