firmware-update: move FwMaxTransferSize to new API

Rewrite "Firmware Maxium Transfer Size" command to use new API.

Tested:
verified using ipmitool raw command.

ipmitools raw 0x8 0x22 //command
02 01 80 00 00 00 02 00 c8 00 00  //output

Signed-off-by: anil kumar appana <anil.kumarx.appana@intel.com>
Change-Id: I4b87c0a397dedcdf70eca8d518536f5510554efa
1 file changed