mt8173: Enable Kconfig options for ChromeOS

This enables some required Kconfig options when CONFIG_CHROMEOS is set.

Change-Id: I290902746c1ea19c8bcb69540e34fde09abb9adf
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: https://review.coreboot.org/18448
Tested-by: build bot (Jenkins)
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/soc/mediatek/mt8173/Kconfig

@@ -17,6 +17,11 @@ config SOC_MEDIATEK_MT8173
 
 if SOC_MEDIATEK_MT8173
 
+config CHROMEOS
+	select VBOOT_OPROM_MATTERS
+	select VBOOT_STARTS_IN_BOOTBLOCK
+	select SEPARATE_VERSTAGE
+
 config MEMORY_TEST
 	bool
 	default n