vboot: route all resets through a single function

It is necessary to trigger console buffer contents dump on reset.
Let's make sure all vboot resets are routed through the same function.

BRANCH=none
BUG=chromium:475347
TEST=built and booted storm

Change-Id: I0d8580fb65417ba4b06dfae763dd6455afc8fc26
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 9788e2043cb1bd5df7e30574f7df4de4f25caa0d
Original-Change-Id: Iafca416700c51a0546249438ca583a415a1ca944
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/265292
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/9931
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/vendorcode/google/chromeos/chromeos.h

@@ -87,5 +87,6 @@ static inline void chromeos_reserve_ram_oops(struct device *dev, int idx) {}
 #endif /* CONFIG_CHROMEOS_RAMOOPS */
 
 void cbmem_add_vpd_calibration_data(void);
+void vboot_reboot(void);
 
 #endif /* __CHROMEOS_H__ */