[XS] Change in coreboot[main]: acpigen_ps2_keybd: Support an Accessibility key

[Aseda Aboagye (Code Review)]

Attention is currently required from: Aseda Aboagye, Cliff Huang, Forest Mittelberg, Lance Zhao, Tim Wawrzynczak.

Hello Caveh Jalali, Cliff Huang, Forest Mittelberg, Lance Zhao, Tim Wawrzynczak, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/82996?usp=email

to look at the new patch set (#4).

Change subject: acpigen_ps2_keybd: Support an Accessibility key
......................................................................

acpigen_ps2_keybd: Support an Accessibility key

Add support for an Accessibility key. HUTRR116 added support for a new
usage titled "System Accessibility Binding" which toggles a
system-wide bound accessibility UI or command.

BUG=b:333095388
TEST=Build and flash a board that contains an accessibility key. Verify
that KEY_ACCESSIBILITY is generated in the Linux kernel with patches[0]
that add this new event code using `evtest`.
```
Testing ... (interrupt to exit)
Event: time 1718924048.882841, -------------- SYN_REPORT ------------
Event: time 1718924054.062428, type 4 (EV_MSC), code 4 (MSC_SCAN), value a9
Event: time 1718924054.062428, type 1 (EV_KEY), code 590 (?), value 1
Event: time 1718924054.062428, -------------- SYN_REPORT ------------
Event: time 1718924054.195904, type 4 (EV_MSC), code 4 (MSC_SCAN), value a9
Event: time 1718924054.195904, type 1 (EV_KEY), code 590 (?), value 0
Event: time 1718924054.195904, -------------- SYN_REPORT ------------
```

[0] - https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git/commit/?id=0c7dd...

Change-Id: Ifc639b37e89ec251f55859331ab5c2f4b2b45a7d
Signed-off-by: Aseda Aboagye 
---
M src/acpi/acpigen_ps2_keybd.c
M src/ec/google/chromeec/ec_acpi.c
M src/include/acpi/acpigen_ps2_keybd.h
3 files changed, 3 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/96/82996/4