tegra124: Build verstage when CHROMEOS is selected

This includes the proper Kconfig options (based on the chromium os
coreboot configuration) for setting up verstage on tegra124 devices.

Change-Id: I4a1976ff684a417cae6fa718ef53cad763cee47d
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: https://review.coreboot.org/15451
Tested-by: build bot (Jenkins)
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/soc/nvidia/tegra124/Kconfig

@@ -18,6 +18,9 @@ if SOC_NVIDIA_TEGRA124
 
 config CHROMEOS
 	select VBOOT_OPROM_MATTERS
+	select VBOOT_STARTS_IN_BOOTBLOCK
+	select SEPARATE_VERSTAGE
+	select CHIPSET_PROVIDES_VERSTAGE_MAIN_SYMBOL
 
 config TEGRA124_MODEL_TD570D
 	bool "TD570D"