[S] Change in coreboot[main]: mb/asus/p8x7x-series: Enable keyboard/mouse swap option

[Keith Hui (Code Review)]

Attention is currently required from: Keith Hui, Nico Huber.

Hello Nico Huber, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/81885?usp=email

to look at the new patch set (#3).

Change subject: mb/asus/p8x7x-series: Enable keyboard/mouse swap option
......................................................................

mb/asus/p8x7x-series: Enable keyboard/mouse swap option

Add HAVE_SHARED_PS2_PORT Kconfig and associated cmos.layout and
cmos.default entries to p8z77-m[_pro], p8z77-v_lx2, p8h77-v, where
their owners manual indicated a single shared PS/2 port, to enable
switching said port between keyboard and mouse duties.

At this time the switch has to be done manually via nvramtool.

Made possible by commit xxxxxxxxxxxx ("sio/nuvoton: Implement a common
ramstage ACPI LDN helper").

TEST=On p8z77-m, PS/2 mouse (Logitech M-S48) works with option turned
on. PS/2 keyboard (IBM Model M #1391401 and Microsoft Natural gen 1)
still works with option off.

Change-Id: I21b73da99168e751b1a23485d4b1695963f9eef5
Signed-off-by: Keith Hui 
---
M src/mainboard/asus/p8x7x-series/Kconfig
M src/mainboard/asus/p8x7x-series/variants/p8h77-v/cmos.default
M src/mainboard/asus/p8x7x-series/variants/p8h77-v/cmos.layout
M src/mainboard/asus/p8x7x-series/variants/p8z77-m/cmos.default
M src/mainboard/asus/p8x7x-series/variants/p8z77-m/cmos.layout
M src/mainboard/asus/p8x7x-series/variants/p8z77-m_pro/cmos.default
M src/mainboard/asus/p8x7x-series/variants/p8z77-m_pro/cmos.layout
M src/mainboard/asus/p8x7x-series/variants/p8z77-v_lx2/cmos.default
M src/mainboard/asus/p8x7x-series/variants/p8z77-v_lx2/cmos.layout
9 files changed, 15 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/85/81885/3