Add convert current channel number function
Add convert current channel number function

Support for convert current channel number based on
ipmi::Context is added.

Tested:
Verified by updating the channel number manually and function
returns correctly. For correct value another gerrit patch is needed
which will advertise proper channel from which the command
originated.

Change-Id: Id17d87b6a945b0264c8f14348a50bc2c087d187e
Signed-off-by: Richard Marian Thomaiyar <72ed7ca0c1d67ded0b254900bd2112efa735a144@linux.intel.com>

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