vboot: Init vb2 work memory area before calling verstage

Otherwise it'll determine some offsets from uninitialized data and hilarity
ensues.

Change-Id: I6a671987857cfd3f3cd6078aebd13dd09fc79020
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10660
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/vendorcode/google/chromeos/vboot2/vboot_loader.c

@@ -90,6 +90,7 @@ static int vboot_active(struct asset *asset)
 		init_vb2_working_data();
 		verstage_main();
 	} else if (verstage_should_load()) {
+		init_vb2_working_data();
 		struct prog verstage =
 			PROG_INIT(ASSET_VERSTAGE,
 				CONFIG_CBFS_PREFIX "/verstage");