Intel OEM commands

Intel platform defines a set of OEM commands. They are required by
Intel BIOS.

This change adds 5 OEM commands:
1.get chassis identifier
Return chassis serial number

2.set system GUID
Sets the system GUID obtained according to the format of the IPMI
2.0 Get System GUID command. While the setting is persistent in the
BMC, the BIOS may choose to over-write the value during POST.

3.set BIOS ID
BIOS version string

4.get device info
BMC/HSC/ME version

5.get AIC(add-in-card) FRU
Add-in-card FRU info

Tested: Test with ipmitool raw command on Intel S2600WF
Platform. BIOS calling is also verified by checking ipmi handler
log (journalctl -ef).

Change-Id: I658c5845cd1252f55dc5d24dfc142281b6a38363
Signed-off-by: Jia, Chunhui <chunhui.jia@linux.intel.com>
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