google/veyron_speedy: Add chromeos.c to romstage

vboot requires it.

Change-Id: Iae2310c9b9c311c3f64b8417295685261ba404b0
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10659
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/google/veyron_speedy/Makefile.inc

@@ -26,6 +26,7 @@ verstage-y += chromeos.c
 verstage-y += reset.c
 
 romstage-y += boardid.c
+romstage-y += chromeos.c
 romstage-y += romstage.c
 romstage-y += sdram_configs.c
 romstage-y += reset.c