eth: bnxt: fix warning for define in struct_group

Fix C=1 warning with sparse 0.6.4:

drivers/net/ethernet/broadcom/bnxt/bnxt.c: note: in included file:
drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h:30:1: warning: directive in macro's argument list

Don't put defines in a struct_group().
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20230727190726.1859515-3-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h

@@ -27,11 +27,12 @@ struct bnxt_cos2bw_cfg {
 		u8		queue_id;
 		__le32		min_bw;
 		__le32		max_bw;
-#define BW_VALUE_UNIT_PERCENT1_100		(0x1UL << 29)
 		u8		tsa;
 		u8		pri_lvl;
 		u8		bw_weight;
 	);
+/* for min_bw / max_bw */
+#define BW_VALUE_UNIT_PERCENT1_100		(0x1UL << 29)
 	u8			unused;
 };