vboot: when configured, pass the wipeout request to vboot

It has become necessary to be able to "factory reset" certain devices
on firmware request.

The vboot package has been modified to provide the necessary API, this
patch introduces a configuration option and uses the API when
enabled.

CQ-DEPEND=CL:259857
BRANCH=storm
BUG=chrome-os-partner:37219
TEST=with all the patches applied, on storm, holding the recovery
     button at startup for 10 seconds, causes 'crossystem
     wipeout_request' to report '1'.

Change-Id: I5e57bc05af3753f451626021ba30c7726badb7b4
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: f70e03e9a8c55bf3c45b075ae4fecfd25da4f446
Original-Change-Id: I4c2192da4fabfdef34d527e5b80d137634eb6987
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/259843
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/9862
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/include/bootmode.h b/src/include/bootmode.h
index 55e3f5f..bad17af 100644
--- a/src/include/bootmode.h
+++ b/src/include/bootmode.h
@@ -26,6 +26,7 @@
 int get_developer_mode_switch(void);
 int get_recovery_mode_switch(void);
 int clear_recovery_mode_switch(void);
+int get_wipeout_mode_switch(void);
 
 
 int gfx_get_init_done(void);