drbd: Use more generic constant names

These constants are useful for the same purpose in more than one place.
Signed-off-by: NPhilipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: NLars Ellenberg <lars.ellenberg@linbit.com>

include/linux/drbd_limits.h

@@ -113,10 +113,10 @@
 #define DRBD_AL_EXTENTS_MAX  6433
 #define DRBD_AL_EXTENTS_DEF  127
 
-#define DRBD_RESYNC_AFTER_MIN  -1
-#define DRBD_RESYNC_AFTER_MAX  (1<<30)
-#define DRBD_RESYNC_AFTER_DEF  -1
-#define DRBD_RESYNC_AFTER_SCALE '1'
+#define DRBD_MINOR_NUMBER_MIN  -1
+#define DRBD_MINOR_NUMBER_MAX  (1<<30)
+#define DRBD_MINOR_NUMBER_DEF  -1
+#define DRBD_MINOR_NUMBER_SCALE '1'
 
 /* } */