chassishandler: Add support for boot type flag (Legacy/EFI)
chassishandler: Add support for boot type flag (Legacy/EFI)

Add support for IPMI boot type field of a
"Get System Boot Options" сommand:

[1] - BIOS boot type (for BIOS that support both legacy and EFI boots)
  0b = "PC compatible" boot (legacy)
  1b = Extensible Firmware Interface Boot (EFI)

For the architectures that don't implement Legacy/EFI boot type
property (for example POWER), always return EFI boot type.

Signed-off-by: Konstantin Aladyshev <966fa2632e4e2a876c19833f9995ee957bdb2a69@gmail.com>
Change-Id: Ifc052b988af86f02a7665ed0477b364c243e9f71

openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid