devlink: fix the name of eswitch commands

devlink: fix the name of eswitch commands

BugLink: http://bugs.launchpad.net/bugs/1676388
The eswitch_[gs]et command is supposed to be similar to port_[gs]et
command - for multiple eswitch attributes. However, when it was introduced
by 08f4b5918b2d ("net/devlink: Add E-Switch mode control") it was wrongly
named with the word "mode" in it. So fix this now, make the oririnal
enum value existing but obsolete.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit adf200f31c000d707e4afe238ed1d1199e0cce7c)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>