When seaboard_defconfig is compiled with LTO, the compiler complains
about some instructions not being supported in ARM mode.
This is caused by arch/arm/mach-tegra/tegra20/warmboot_avp.c having
different CFLAGS declared in Makefile. This file needs to be compiled
without LTO.
Fix this by removing -flto for this file.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Simon Glass <sjg@chromium.org>