minor fix: corrected cc for get channel access
minor fix: corrected cc for get channel access

As per IPMI spec, get channel access don't have
specific cc code 0x83(Access mode not supported).
Whereas set channel access has that specific cc.
So changed cc to generic 0xcc(invalid field request)
in get channel access mode command.

Tested:
For reserved access mode byte 2 request, return 0xCC.
ipmitool -I lanplus -U <> -P <> -H <IP> raw 6 0x41 0x01 0x00
Unable to send RAW command (channel=0x0 netfn=0x6 lun=0x0
cmd=0x41 rsp=0xcc): Invalid data field in request

Change-Id: I75256b9f74eddaf95a9f78d95730332877d21dfd
Signed-off-by: AppaRao Puli <9d4b3e4e97bb3f461adde561791b99ab3b508cab@linux.intel.com>

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