Merge branch 'mlxsw-Remove-compatibility-with-old-firmware'

Jiri Pirko says:

====================
mlxsw: Remove compatibility with old firmware

Up until recently we couldn't enforce a minimal firmware version, which
forced us to be compatible with old firmware versions. This patchset
removes this code and simplifies the driver.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>