Makefile: Fix missed boolean flags
Makefile: Fix missed boolean flags

Fix flags missed in CL:3306615.

BUG=b:206031372
TEST=make runtests
TEST=sudo emerge-guybrush sys-boot/depthcharge
BRANCH=none

Signed-off-by: Jakub Czapiga <0f3eddc93757beb8c6a4b0b682eaf1bf65ec5c4e@semihalf.com>
Change-Id: Idbb205bb9e14f44a10806785fb9f7b29572f0626
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3347667
Reviewed-by: Yu-Ping Wu <e17b963d2ce5bddd1fecae25c320252b132e804d@chromium.org>
Tested-by: Jakub Czapiga <0d8ca27a83d6ce60a79cbbd5669c90d47d7d7de8@google.com>
Commit-Queue: Jakub Czapiga <0d8ca27a83d6ce60a79cbbd5669c90d47d7d7de8@google.com>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot