Return channel in get system restart cause

The ipmi spec says that we should return the channel
as the last byte in get system restart cause. This was
not available when the command was originally written.
Now, it is available from the ipmi::Context

Tested: Check that channel in the response matches the
        channel the request came in on.

Change-Id: I6490c0b6fa41f78292aa002c17de39b31b7ee032
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
1 file changed