fix file specification in comments

Many files include the filename at the beginning, serveral used a wrong one.

Signed-off-by: Uwe Zeisberger <Uwe_Zeisberger@digi.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/arch/ppc/platforms/powerpmc250.h b/arch/ppc/platforms/powerpmc250.h
index 41a6dc8..d33ad8dc 100644
--- a/arch/ppc/platforms/powerpmc250.h
+++ b/arch/ppc/platforms/powerpmc250.h
@@ -1,5 +1,5 @@
 /*
- * include/asm-ppc/platforms/powerpmc250.h
+ * arch/ppc/platforms/powerpmc250.h
  *
  * Definitions for Force PowerPMC-250 board support
  *