s390/zcore: remove unneeded linux/miscdevice.h include

drivers/s390/char/zcore.c does not contain any miscdevice so the
inclusion of linux/miscdevice.h is uncessary.
Signed-off-by: NCorentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/char/zcore.c

@@ -15,7 +15,6 @@
 
 #include <linux/init.h>
 #include <linux/slab.h>
-#include <linux/miscdevice.h>
 #include <linux/debugfs.h>
 #include <linux/memblock.h>