mainboards: Remove default CHROMEOS=y

Even the boards with MAINBOARD_HAS_CHROMEOS need to be build-tested
with CHROMEOS=n.

Change-Id: I16fcf62a23dae1b21c77cee275c867f9c1de893b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50118
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>

0 files changed, 0 insertions, 0 deletions