The CREDITS file was removed from barebox in 2015 by commit 6570288f2d97
("Remove the CREDITS file"). Remove references to it from several files.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add the first pxa3xx board, zylonite. Zylonite is the Marvell System
Development Platform.

Several version are available, based on either :
 - PXA300
 - PXA310
 - PXA320

This version was only tested on a PXA310 based board, and uses :
 - the ethernet controller
 - the nand controller

These drivers seem to be common to all zylonite boards.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>