ipmi_fru_info_area: Pad output buffer.
ipmi_fru_info_area: Pad output buffer.

Always pad the output buffer to the maximum IPMI FRU size. This enables
tools like ipmitool to write a new FRU blob with data longer than the
original payload.

Change-Id: Id6eb2c80504fb42ac72d7b643d186e9641a0832c
Signed-off-by: Oskar Senft <84f0476efdca0c1c948a668f44dc9cf739ba9f1a@google.com>

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