octeontx2-af: Provision to make kernel backward compatible with older firmware

commit dea94b78a106aa5c567ca7b00a43b75a515f79b0 from
git@git.assembla.com:cavium/WindRiver.linux.git

Firmware interface checks are now relaxed to major version.
Major version would change only if there is structural change
in existing commands that breaks functionality.

This would make kernel backward compatible with older firmware
as much as possible.

Change-Id: Ibdb52cc62908f3dbfb84c4d97b98ec3118545f36
Signed-off-by: Linu Cherian <lcherian@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/26749


Reviewed-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Tested-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>