ui: Add VB2_UI_ERROR_MINIOS_BOOT_FAILED

Add a new error type VB2_UI_ERROR_MINIOS_BOOT_FAILED for MiniOS boot
failure.

BUG=b:200750322
TEST=emerge-cherry depthcharge
BRANCH=none

Change-Id: Ia567c9ec735e7aae830ad311b2261e01fed53876
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3249590
Reviewed-by: Hsuan Ting Chen <roccochen@chromium.org>
Reviewed-by: Jae Hoon Kim <kimjae@chromium.org>
diff --git a/firmware/2lib/include/2api.h b/firmware/2lib/include/2api.h
index 1f9d70f..c17da8d 100644
--- a/firmware/2lib/include/2api.h
+++ b/firmware/2lib/include/2api.h
@@ -1497,6 +1497,8 @@
 enum vb2_ui_error {
 	/* No error */
 	VB2_UI_ERROR_NONE = 0,
+	/* MiniOS boot failed */
+	VB2_UI_ERROR_MINIOS_BOOT_FAILED,
 	/* Dev mode already enabled */
 	VB2_UI_ERROR_DEV_MODE_ALREADY_ENABLED,
 	/* Untrusted confirmation */