[SCSI] Mark some core scsi data structures const

patch below marks a few scsi core datastructures as const, so that they end up
in the .rodata section and don't cacheline share with things that get dirtied

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index d68cea7..a3fa64c 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -730,7 +730,7 @@
 	unsigned int the_result;
 	int retries, rc, n;
 
-	static char *loadmech[] =
+	static const char *loadmech[] =
 	{
 		"caddy",
 		"tray",