ice: remove unused macro

The driver had an unused define that can be removed.  Found by
compiler -Werror=unused-macros check.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ice/ice_dcb_nl.c

@@ -7,8 +7,6 @@
 #include "ice_dcb_nl.h"
 #include <net/dcbnl.h>
 
-#define ICE_APP_PROT_ID_ROCE	0x8915
-
 /**
  * ice_dcbnl_devreset - perform enough of a ifdown/ifup to sync DCBNL info
  * @netdev: device associated with interface that needs reset