ixgbevf: fix sparse warnings

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

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>

drivers/net/ethernet/intel/ixgbevf/ixgbevf.h

@@ -281,7 +281,7 @@ enum ixgbevf_boards {
 
 extern struct ixgbevf_info ixgbevf_82599_vf_info;
 extern struct ixgbevf_info ixgbevf_X540_vf_info;
-extern struct ixgbe_mbx_operations ixgbevf_mbx_ops;
+extern const struct ixgbe_mbx_operations ixgbevf_mbx_ops;
 
 /* needed by ethtool.c */
 extern char ixgbevf_driver_name[];

drivers/net/ethernet/intel/ixgbevf/mbx.c

@@ -26,6 +26,7 @@
 *******************************************************************************/
 
 #include "mbx.h"
+#include "ixgbevf.h"
 
 /**
  *  ixgbevf_poll_for_msg - Wait for message notification
@@ -328,7 +329,7 @@ static s32 ixgbevf_init_mbx_params_vf(struct ixgbe_hw *hw)
 	return 0;
 }
 
-struct ixgbe_mbx_operations ixgbevf_mbx_ops = {
+const struct ixgbe_mbx_operations ixgbevf_mbx_ops = {
 	.init_params   = ixgbevf_init_mbx_params_vf,
 	.read          = ixgbevf_read_mbx_vf,
 	.write         = ixgbevf_write_mbx_vf,

drivers/net/ethernet/intel/ixgbevf/vf.c

@@ -26,6 +26,7 @@
 *******************************************************************************/
 
 #include "vf.h"
+#include "ixgbevf.h"
 
 /**
  *  ixgbevf_start_hw_vf - Prepare hardware for Tx/Rx