scsi: target: sbp: Remove KMSG_COMPONENT macro

The KMSG_COMPONENT macro is a leftover of the s390 specific "kernel
message catalog" from 2008 [1] which never made it upstream.

The macro was added to s390 code to allow for an out-of-tree patch which
used this to generate unique message ids. Also this out-of-tree doesn't
exist anymore.

The pattern of how the KMSG_COMPONENT is used was partially also used
for non s390 specific code, for whatever reasons.

Remove the macro in order to get rid of a pointless indirection.

[1] https://lwn.net/Articles/292650/

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://patch.msgid.link/20251126144027.2213895-1-hca@linux.ibm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: hcahca

drivers/target/sbp/sbp_target.c

@@ -5,8 +5,7 @@
  * Copyright (C) 2011  Chris Boot <bootc@bootc.net>
  */
 
-#define KMSG_COMPONENT "sbp_target"
-#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+#define pr_fmt(fmt) "sbp_target: " fmt
 
 #include <linux/kernel.h>
 #include <linux/module.h>