x86: cros: Check ROM exists before building vboot
All the x86 devicetree files are built at once, whichever board is actually being built. If coreboot is the target build, CONFIG_ROM_SIZE is not defined and samus cannot build Chromium OS verified boot. Add this condition to avoid errors about CONFIG_ROM_SIZE being missing. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NJaehoon Chung <jh80.chung@samsung.com>
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