dbus-sdr: treat FRUs with a chassis type of "Main Server" as baseboards
dbus-sdr: treat FRUs with a chassis type of "Main Server" as baseboards

Previously this had been restricted to "rack mount" only; the ASRock
Rack E3C246D4I board's FRU EEPROM has it marked as a "main server",
however, so this lets that FRU data get used for FRU ID zero (baseboard
info).

Signed-off-by: Zev Weiss <34674a4f0ab0f0f965eec335549b55441a54f908@bewilderbeest.net>
Change-Id: Iff59b30afcc9fbe1cde15358adfabd37152acd1d

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