mb/ocp/tiogapass: Pull POST complete pin

Tioga Pass platform use GPIO pin of GPP_B20 for POST complete,
BIOS needs to configure this pin for BMC to poll,
so it knows when to start to access other components.

Tested=Read GPIO status (GPIOAA7) in OpenBMC, the value is 0,
the command and result are shown as below,

root@bmc-oob:~# cat /tmp/gpionames/FM_BIOS_POST_CMPLT_N/value
0
root@bmc-oob:~#

Change-Id: I134f80153461c5acd872587038a2207586b658dd
Signed-off-by: BryantOu <Bryant.Ou.Q@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40426
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

0 files changed, 0 insertions, 0 deletions