libdasd: Provide definition for bus id size

dasdview and libdasd deal with DASD bus ids and should use a definition
for the size. libu2s already provides a definition, which is used by
dasdview. However, the size of 32 is a bit much and the definition
should be part of libdasd.

Including the terminating null byte ('\0') and considering a DASD bus id
length of 8 characters (e.g. 0.0.4711), this leads to a size of 9.

Provide such a definition via libdasd and update any user.

Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

dasdview/dasdview.h

@@ -11,7 +11,6 @@
 #define DASDVIEW_H
 
 #include <limits.h>
-#include "lib/u2s.h"
 
 /********************************************************************************
  * SECTION: Definitions needed for DASD-API (see dasd.h)
@@ -109,7 +108,7 @@ typedef struct dasdview_info
 	int f8c;
 	int f9c;
 
-	char busid[U2S_BUS_ID_SIZE];
+	char busid[DASD_BUS_ID_SIZE];
 	int busid_valid;
 	int raw_track_access;
 	struct zdsroot *zdsroot;