treewide: remove references to CREDITS ...

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>

ratp: fix incorrect whitespaces in method calls ...

This is a simple coding style fix to avoid the whitespace before the
open-parenthesis in method calls.

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ratp: use pr_ macros to print messages ...

Following suggestions in other patch reviews, the RAPT commands are
updated to use pr_err() instead of plain printf() to report errors
to the user.

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ratp: use __packed instead of the full form ...

Just a minor coding style change to follow the suggestions given in
patch reviews for other RATP commands.

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ratp: new reset command ...

E.g.:
    $ ./bbremote -v --port /dev/ttyUSB2 reset

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>