Fixes a bug in Makefile.inc.
BUG=b:236576117
BRANCH=None
TEST=emerge-nissa coreboot
Signed-off-by: Ian Feng <ian_feng@compal.corp-partner.google.com>
Change-Id: I2664df961a1fc0cd904a5e742face20c3fc8c3c9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65450
Reviewed-by: Reka Norman <rekanorman@chromium.org>
Reviewed-by: Frank Wu <frank_wu@compal.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>