security/vboot: relocate vb2ex_abort and vb2ex_printf

Enabling an assertion in vb2_member_of() results in coreboot
linking vb2ex_abort() and vb2ex_printf() in ramstage.

Move these two functions from vboot_logic.c to vboot_lib.c,
which is should be enabled in all stages if CONFIG_VBOOT_LIB
is enabled.  Note that CONFIG_VBOOT_LIB is implied by
CONFIG_VBOOT.

Relevant vboot_reference commit: CL:2037263.

BUG=b:124141368, chromium:1005700
TEST=make clean && make test-abuild
BRANCH=none

Change-Id: Ica0103c5684b3d50ba7dc1b4c39559cb192efa81
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38706
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/security/vboot/vboot_lib.c

@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* This file is part of the coreboot project. */
+
+#include <console/console.h>
+#include <console/vtxprintf.h>
+#include <vb2_api.h>
+
+/*
+ * vboot callbacks implemented by coreboot -- necessary for making general API
+ * calls when CONFIG_VBOOT_LIB is enabled.  For callbacks specific to verstage
+ * (CONFIG_VBOOT), please see vboot_logic.c.
+ */
+
+void vb2ex_printf(const char *func, const char *fmt, ...)
+{
+	va_list args;
+
+	if (func)
+		printk(BIOS_INFO, "VB2:%s() ", func);
+
+	va_start(args, fmt);
+	vprintk(BIOS_INFO, fmt, args);
+	va_end(args);
+}
+
+void vb2ex_abort(void)
+{
+	die("vboot has aborted execution; exit\n");
+}