[Bionic SRU][Patch 0/1] Fix to ipmi to support vendor specific messages greater than 255 bytes

[Manoj Iyer]

Please consider the following patch to fix mulipart ipmi transmit
messages. Currently ipmi raw commands greater than 255 bytes fail,
eg transmitting hostname with ipmi.

This fixes bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1799794

The patch was cleanly cherry-picked from linux-next on to bionic, and 
tested on a Cavium Thunder X2 system. Please refer to the bug report
for detailed test results.