vboot: remove old vboot_fill_handoff function header

This function was removed in CB:33535.

BUG=b:124141368
TEST=make clean && make runtests
BRANCH=none

Change-Id: Ifded75319c92dcbb4befbb3fbecc1cd2df8a9ad0
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37588
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
diff --git a/src/security/vboot/misc.h b/src/security/vboot/misc.h
index d03e76e..1fda8b4 100644
--- a/src/security/vboot/misc.h
+++ b/src/security/vboot/misc.h
@@ -53,11 +53,6 @@
 			  struct region_device *fw);
 
 /*
- * Source: security/vboot/vboot_handoff.c
- */
-void vboot_fill_handoff(void);
-
-/*
  * Source: security/vboot/bootmode.c
  */
 void vboot_save_recovery_reason_vbnv(void);