ARM: 926ejs: use debug() for misaligned addresses

Misaligned warnings are useful to debug faulty drivers.
A misaligned warning is printed also when the driver
is correct - use debug() instead of printf().

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Albert Aribaud <albert.u.boot@aribaud.net>
CC: Mike Frysinger <vapier@gentoo.org>
CC: Marek Vasut <marex@denx.de>
Acked-by: Marek Vasut <marex@denx.de>