arm: mvebu: turris_omnia: Enable LTO by default on Turris Omnia

U-Boot builds for Turris Omnia are approaching the limit of 0xf0000
bytes, which is the size of the U-Boot partition on Omnia.

Enable LTO to get more size optimized binaries.

Signed-off-by: Marek BehĂșn <kabel@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
1 file changed