This patch improves the detection of Super-I/O it87 chips (IT8712F,
IT8705F).

* Find the IT8712F and IT8705F address through Super-I/O (as opposed to
  IT8712F only so far).

* Verify that the device is activated. Print info lines if a
  disactivated or unconfigured chip is found.

* Print an info line when finding either chip, with device name,
  address and revision.

* Rearrange code in it87_find() (error path).

* (bonus) Get rid of the useless i2c_client id.

Successfully tested on two IT8712F and one IT8705F, thanks to Jonas
Munsin, Rudolf Marek and Karine Proot.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>