ixgbevf: fix sparse warnings

ixgbevf: fix sparse warnings

Fixes sparse warnings:
drivers/net/ixgbevf/vf.c:418:21: warning: symbol 'ixgbevf_82599_vf_info' was not declared. Should it be static?
drivers/net/ixgbevf/vf.c:423:21: warning: symbol 'ixgbevf_X540_vf_info' was not declared. Should it be static?
drivers/net/ixgbevf/mbx.c:331:29: warning: symbol 'ixgbevf_mbx_ops' was not declared. Should it be static?

(cherry picked from commit b5417bf8e8952401bca69ded67c30ead484af823)
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Tested-by: Sibai Li <sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Joe Jin <joe.jin@oracle.com>