fix comments with new drivers organization

Signed-off-by: Marcel Ziswiler <marcel@ziswiler.com>
diff --git a/cpu/ppc4xx/4xx_pci.c b/cpu/ppc4xx/4xx_pci.c
index a68c419..a5b9690 100644
--- a/cpu/ppc4xx/4xx_pci.c
+++ b/cpu/ppc4xx/4xx_pci.c
@@ -339,7 +339,7 @@
 }
 
 /*
- * drivers/pci.c skips every host bridge but the 405GP since it could
+ * drivers/pci/pci.c skips every host bridge but the 405GP since it could
  * be set as an Adapter.
  *
  * I (Andrew May) don't know what we should do here, but I don't want