powerpc: Fix comment around arch specific definition of RECLAIM_DISTANCE

Commit 32e45ff43eaf5c17f changed the default value of
RECLAIM_DISTANCE to 30. However the comment around arch
specifc definition of RECLAIM_DISTANCE is not updated to
reflect the same. Correct the value mentioned in the comment.

Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: KOSAKI Motohiro <Kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/topology.h

@@ -12,7 +12,7 @@ struct device_node;
  * Before going off node we want the VM to try and reclaim from the local
  * node. It does this if the remote distance is larger than RECLAIM_DISTANCE.
  * With the default REMOTE_DISTANCE of 20 and the default RECLAIM_DISTANCE of
- * 20, we never reclaim and go off node straight away.
+ * 30, we never reclaim and go off node straight away.
  *
  * To fix this we choose a smaller value of RECLAIM_DISTANCE.
  */