s390/sclp: Use DECLARE_BITMAP

Use the generic mechanism to declare a bitmap instead of unsigned long.

Signed-off-by: Joe Perches <[e-mail]>
Signed-off-by: Heiko Carstens <[e-mail]>
Signed-off-by: Martin Schwidefsky <[e-mail]>

drivers/s390/char/sclp_cmd.c

···
 static DEFINE_MUTEX(sclp_mem_mutex);
 static LIST_HEAD(sclp_mem_list);
 static u8 sclp_max_storage_id;
-static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
+static DECLARE_BITMAP(sclp_storage_ids, 256);
 static int sclp_mem_state_changed;
 
 struct memory_increment {