arm: mvebu: Remove unused macro CONFIG_SYS_U_BOOT_OFFS

Macro CONFIG_SYS_U_BOOT_OFFS is set but not used anymore. Remove it.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
12 files changed