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/drivers/serial/21285.c b/drivers/serial/21285.c
index 5743832..76d83ad 100644
--- a/drivers/serial/21285.c
+++ b/drivers/serial/21285.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/char/21285.c
+ * linux/drivers/serial/21285.c
  *
  * Driver for the serial port on the 21285 StrongArm-110 core logic chip.
  *