Add sel entry

Add sel entry for ipmi raw command

Tested:`ipmitool raw 0x0a 0x44 0x00 0x01 0x02 0x00 0x00 0x00
0x00 0x20 0x00 0x04 0x14 0x8a 0x6f 0x00 0x00 0x00` for power_button
pressed,`ipmitool sel list` can see
 1 | 01/24/21 | 02:02:06 UTC | Button #0x8a | Power Button pressed | Asserted

Signed-off-by: Lotus Xu <xuxiaohan@bytedance.com>
Change-Id: I5a6bff109e5d12707a3a74570e6b7a584c7117bf
2 files changed