RDMA/hfi1: Remove all traces of diagpkt support

One of the concessions we made to get our driver upstream was to remove
the diagnostic packet support. There is however still some cruft that was
left over.  Remove it.

Link: https://lore.kernel.org/r/20220520183727.48973.93587.stgit@awfm-01.cornelisnetworks.com
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: ddalessa

drivers/infiniband/hw/hfi1/common.h

@@ -137,29 +137,6 @@
 #define HFI1_USER_SWVERSION ((HFI1_USER_SWMAJOR << HFI1_SWMAJOR_SHIFT) | \
 			     HFI1_USER_SWMINOR)
 
-/*
- * Diagnostics can send a packet by writing the following
- * struct to the diag packet special file.
- *
- * This allows a custom PBC qword, so that special modes and deliberate
- * changes to CRCs can be used.
- */
-#define _DIAG_PKT_VERS 1
-struct diag_pkt {
-	__u16 version;		/* structure version */
-	__u16 unit;		/* which device */
-	__u16 sw_index;		/* send sw index to use */
-	__u16 len;		/* data length, in bytes */
-	__u16 port;		/* port number */
-	__u16 unused;
-	__u32 flags;		/* call flags */
-	__u64 data;		/* user data pointer */
-	__u64 pbc;		/* PBC for the packet */
-};
-
-/* diag_pkt flags */
-#define F_DIAGPKT_WAIT 0x1	/* wait until packet is sent */
-
 /*
  * The next set of defines are for packet headers, and chip register
  * and memory bits that are visible to and/or used by user-mode software.