Fix regression introduced by a typo in "Tidied other cpu/arm920t/start.S code"

Restore logic reverted by commit

commit 80767a6c
Author: Peter Pearse <peter.pearse@arm.com>
Date:   Wed Sep 5 16:04:41 2007 +0100

    Changed API name to coloured_led.h
    Removed code using deprecated ifdef CONFIG_BOOTBINFUNC
    Tidied other cpu/arm920t/start.S code

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>