atomic: use <linux/atomic.h>

This allows us to move duplicated code in <asm/atomic.h>
(atomic_inc_not_zero() for now) to <linux/atomic.h>

Signed-off-by: Arun Sharma <asharma@fb.com>
Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Miller <davem@davemloft.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 4ba8521..2720884 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -16,7 +16,7 @@
  *		- Add neighbour cache statistics like rtstat
  */
 
-#include <asm/atomic.h>
+#include <linux/atomic.h>
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <linux/rcupdate.h>