mb/ocp/deltalake: Add ipmi POST start command in romstage

Add function to send POST start command to BMC. This function is
used in romstage and the POST end command will be sent in u-root.

TEST=Read POST command log in OpenBMC,
if command received successfully, message may show as below,

root@bmc-oob:~# cat /var/log/messages |grep -i "POST"
 2020 Jul 15 16:36:11 bmc-oob. user.info fby3-v2020.23.1:
ipmid: POST Start Event for Payload#2
root@bmc-oob:~#

Signed-off-by: TimChu <Tim.Chu@quantatw.com>
Change-Id: Ide0e2a52876db555ed8b5e919215e85731fd80ed
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41605
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

0 files changed, 0 insertions, 0 deletions