Implement get/set platform serial port parameters command

This command is used for BIOS to set/get host serial host configuration.

Tested:
set config:
ipmitool raw 0x32 0x90 1 0
get config:
ipmitool raw 0x32 0x90 0

Change-Id: I97feebbfd88033a186e19e6f53ab92a240902603
Signed-off-by: Yong Li <yong.b.li@linux.intel.com>
2 files changed