guybrush: Enable linker time optimizations
guybrush: Enable linker time optimizations

Enable CONFIG_LTO

BUG=None
BRANCH=None
TEST=Build

Signed-off-by: Rob Barnes <3ced0940a2329ce70499686f01d3d60685ec66ed@google.com>
Change-Id: I0e52ffd8d8b63e9e4e8d19a717e4329eae8c58fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2645079
Reviewed-by: Denis Brockus <6b21e8190fb5e373363fb95271367073a16474ef@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec