s390/tape: remove even more tape block leftovers

Fix this compile error:

In file included from drivers/s390/char/tape_core.c:29:0:
drivers/s390/char/tape_std.h:103:66: warning: ‘struct request’ declared inside parameter list [enabled by default]
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/char/tape.h

@@ -15,7 +15,6 @@
 #include <asm/ccwdev.h>
 #include <asm/debug.h>
 #include <asm/idals.h>
-#include <linux/blkdev.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mtio.h>

drivers/s390/char/tape_std.h

@@ -100,11 +100,7 @@ struct tape_request *tape_std_read_block(struct tape_device *, size_t);
 void tape_std_read_backward(struct tape_device *device,
 			    struct tape_request *request);
 struct tape_request *tape_std_write_block(struct tape_device *, size_t);
-struct tape_request *tape_std_bread(struct tape_device *, struct request *);
-void tape_std_free_bread(struct tape_request *);
 void tape_std_check_locate(struct tape_device *, struct tape_request *);
-struct tape_request *tape_std_bwrite(struct request *,
-				     struct tape_device *, int);
 
 /* Some non-mtop commands. */
 int tape_std_assign(struct tape_device *);