Correct ffs/fls regression for PowerPC etc

Commits

  02f99901ed1c9d828e3ea117f94ce2264bf8389e
  52d61227b66d4099b39c8309ab37cb67ee09a405

introduced a regression where platform-specific ffs/fls implementations
were defined away. This patch corrects that by using PLATFORM_xxx
instead of the name itself.

Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Stefan Roese <sr@denx.de>
diff --git a/include/asm-m68k/bitops.h b/include/asm-m68k/bitops.h
index e0c35fa..ad971b4 100644
--- a/include/asm-m68k/bitops.h
+++ b/include/asm-m68k/bitops.h
@@ -51,7 +51,7 @@
 	return r;
 }
 #define __ffs(x) (ffs(x) - 1)
-#define ffs
+#define PLATFORM_FFS
 
 #endif /* __KERNEL__ */