enic: set IG desc cache flag in open

enic: set IG desc cache flag in open

New adapter needs CMD_OPENF_IG_DESCCACHE flag to be set. If this flag is
not set, fw flushes the global IG desc cache. This flag is nop in older
adapter.

Also increment driver version

Signed-off-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 5de0c022f1b0bce073cb04dd69ed7982805e5763)
Orabug: 27587345
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>
Reviewed-by: Kirtikar Kashyap <kirtikar.kashyap@oracle.com>