superio/nuvoton/nct5572d: Add PS/2 presence detect

On certain Super I/O devices, when a PS/2 mouse is not present on the
auxiliary channel both channels will cease to function if the
auxiliary channel is probed while the primary channel is active.
Therefore, knowledge of mouse presence must be gathered by coreboot
during early boot, and used to enable or disable the auxiliary PS/2
port before control is passed to the operating system.

This is added in commit 448e3863 (drivers/pc80: Add PS/2 mouse
presence detect).

Update the Nuvoton NCT5572D driver to flag the auxiliary channel as
disabled if no device was detected. The code is copied from the Winbond
W83667HG-A driver.

Note, the ACPI changes are not part of this commit.

TEST=Currently, on the ASRock E350M1, PS/2 does not work. With this
change, a PS/2 keyboard works fine in SeaBIOS, GRUB in MBR, and Debian
GNU/Linux Sid/unstable with Linux 3.19.

```
[    1.185195] i8042: PNP: No PS/2 controller found. Probing ports directly.
[    1.189110] serio: i8042 KBD port at 0x60,0x64 irq 1
[    1.189133] serio: i8042 AUX port at 0x60,0x64 irq 12
[    1.189970] mousedev: PS/2 mouse device common for all mice
```

Change-Id: I7f9be348d295e70437bef089d4c2173169f38459
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: https://review.coreboot.org/13618
Tested-by: build bot (Jenkins)
Reviewed-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-by: Martin Roth <martinroth@google.com>

0 files changed, 0 insertions, 0 deletions