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>

Code taken from U-Boot. This makes the beagle board much more
reliable.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

This function consists of only inline asm statements, so
use assembly in the first place. Also makes sure that the
function is compiled in arm mode.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Sanjeev Premi <premi@ti.com>