drivers: ipmi: Support for both IPMB Req and Resp

Removed check for request or response in IPMB packets coming from
device as well as from host. Now it supports both way communication
to device via IPMB. Both request and response will be passed to
application.

Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
Message-Id: <20191106182921.1086795-1-vijaykhemka@fb.com>
Reviewed-by: Asmaa Mnebhi <Asmaa@mellanox.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>