mtd: nand: Stop using full path when referring to files placed in the same dir

Some NAND drivers are derived from other NAND drivers and state it in
their license header. Using full path to point to other driver files
sitting in the same directory is not such a good idea, since the NAND
drivers might be moved to a different directory at some point, and we
don't to patch all license/copyright headers everytime this happen.

The only exception where we keep full path is when the referred source
files no longer exist in the tree.
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>

drivers/mtd/nand/ams-delta.c

@@ -3,7 +3,7 @@
  *
  *  Derived from drivers/mtd/toto.c
  *  Converted to platform driver by Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
- *  Partially stolen from drivers/mtd/nand/plat_nand.c
+ *  Partially stolen from plat_nand.c
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as

drivers/mtd/nand/bf5xx_nand.c

@@ -5,10 +5,10 @@
  *
  * Blackfin BF5xx on-chip NAND flash controller driver
  *
- * Derived from drivers/mtd/nand/s3c2410.c
+ * Derived from s3c2410.c
  * Copyright (c) 2007 Ben Dooks <ben@simtec.co.uk>
  *
- * Derived from drivers/mtd/nand/cafe.c
+ * Derived from cafe.c
  * Copyright © 2006 Red Hat, Inc.
  * Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
  *

drivers/mtd/nand/mpc5121_nfc.c

@@ -6,9 +6,8 @@
  * by OSADL membership fees in 2009;  for details see www.osadl.org.
  *
  * Based on original driver from Freescale Semiconductor
- * written by John Rigby <jrigby@freescale.com> on basis
- * of drivers/mtd/nand/mxc_nand.c. Reworked and extended
- * Piotr Ziecik <kosmo@semihalf.com>.
+ * written by John Rigby <jrigby@freescale.com> on basis of mxc_nand.c.
+ * Reworked and extended by Piotr Ziecik <kosmo@semihalf.com>.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License