Add fru get area info command

Added fru get area info command which is required for "ipmi fru"
command. Earlier it was supported through ipmid but with latest
change in ipmid supporting only phosphor-fru, needed to add this
command here.

I would prefer to add entity manager fru support including this
command in phosphor-ipmid which is the best way.

Tested: verified using "ipmi fru" command

Change-Id: I0adff8caa89efc9c30dc8ae17ba91d1e325ba925
Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
2 files changed