[S390] tape: New read configuration data.

Instead of the deprecated read_conf_data(), implement a new function
tape_3590_read_dev_chars().

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/char/tape_3590.h

@@ -129,6 +129,10 @@ struct tape_3590_med_sense {
 	char pad2[116];
 } __attribute__ ((packed));
 
+struct tape_3590_rdc_data {
+	char data[64];
+} __attribute__ ((packed));
+
 /* Datastructures for 3592 encryption support */
 
 struct tape3592_kekl {