[ARM] 3501/1: i.MX: fix lowlevel debug macros

Patch from Sascha Hauer

This patch fixes the addruart macro to work with both mmu enabled and
disabled.

Signed-off-by: Sascha Hauer <s.hauer@pengutonix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>