RDMA/irdma: Delete unused struct irdma_bth

The struct irdma_bth is not used, so remove it.

Link: https://lore.kernel.org/r/20211006201531.469650-1-yanjun.zhu@linux.dev
Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Acked-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/irdma/cm.h

@@ -159,14 +159,6 @@ enum irdma_cm_event_type {
 	IRDMA_CM_EVENT_ABORTED,
 };
 
-struct irdma_bth { /* Base Trasnport Header */
-	u8 opcode;
-	u8 flags;
-	__be16 pkey;
-	__be32 qpn;
-	__be32 apsn;
-};
-
 struct ietf_mpa_v1 {
 	u8 key[IETF_MPA_KEY_SIZE];
 	u8 flags;