kukui: Enable brief asserts to free flash space
kukui: Enable brief asserts to free flash space

Enable CONFIG_DEBUG_ASSERT_BRIEF in RO to free flash space.
Brief asserts print only the file name and the line number.

BUG=None
TEST=Build all
BRANCH=None

Change-Id: I65334ad2c50e4c70f25af7dbbe03302d7d541bc7
Signed-off-by: Rob Barnes <3ced0940a2329ce70499686f01d3d60685ec66ed@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3157760
Reviewed-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>

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